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 ARAOHNIDA 545 forms with the body produced posteriorly into an annotated caudal Micr. Sci. vol. xxiv. N.S. 1884.—13a. Patten and Hazen. prolongation, and the 3rd, 4th, 5th, and 6th pairs of appendages “Development of the Coxal Glands of Limulus,” Journ. of short and only three-jointed. Morphology, vol. xvi. 1900.—13b. Bernard. “Coxal Glands of Family—Demodicidse (Demodex). Scorpio,” Ann. and Mag. Nat. Hist. vol. xii. 1893, p. 55.—14. Sub-order /. Tetrapoda.—Degenerate atracheate gall-mites, in Benham. “Testis of Limulus,” Trans. Linn. Soc. 1882.—15., which the body is produced posteriorly and annulated, as in Lankester. “Mobility of the Spermatozoa of Limulus,” Quart. Demodex, but in which the appendages of the 3rd and 4th Journ. Micr. Sci. vol. xviii. N.S. 1878.—16. Korschelt and pairs are long and normally segmented, and those of the 5th Heider. Entwickelungsgeschichte. Jena, 1892. Ibique citata.— and 6th pairs entirely absent. 17. Laurie. “The Embryology of a Scorpion,” Quart. Journ. Family—Eriophyidse {Eriophyes, Phyllocoptes). Micr. Sci. vol. xxxi. N.S. 1890, and “On Development of Scorpio Remarks on the Rhynchostomi.—The Acari include a number of fulvipes," ibid. vol. xxxii. 1891.—18. Lankester (Homoplasy forms which are of importance and special interest on account of and Homogeny). “ On the Use of the term Homology in Modern their parasitic habits. The ticks (Ixodes) are not only injurious Zoology,” Ann. and Mag. Nat. Hist. 1870.—19. Idem. “Deas blood-suckers, but are now credited with carrying the germs generation, a Chapter in Darwinism,” 1878, reprinted in the of Texas cattle-fever, just as mosquitoes carry those of malaria. Advancement of Science, Macmillan, 1890.—20. Idem. “Limulus an Arachnid,” Q. J. Micr. Sci. vol. xxi. N.S.-—21. Claus. “Degeneration of the Acari and Classification of Arthropoda,” Anzeiger d. k. k. Akad. Wissen. Wien. 1885 ; see also Ann. and Mag. Nat. Hist. (5) vol. xvii. 1886, p. 364, and vol. xix. p. 225.—22. Lindstrom, G. “Researches on the Visual Organs of the Trilobites, ” K. Svenska Vet. Akad. Handl. xxxiv. No. 8, pp. 1-86, Pis. i.-vi. 1901.—22*. Zittel. American edition of his Pateontology (the Macmillan Co., New York), where ample references to the literature of Trilobitse and Euryptini will be found ; also references to literature of fossil Scorpions and Spiders.—23. Hoek. “Report on the Pycnogonida,” Challenger Expedition Reports, 1881.—Meinert. “Pycnogonida of the Danish Ingolf Expedition, ” vol. hi. 1899.—Morgan. “Embryology and Phylogeny of the Pycnogonids,” Biol. Lab. Baltimore, vol. v. 1891.—24. Bourne, A. G. “The Reputed Suicide of the Scorpion,” Proc. Roy. Soc. vol. xlii. pp. 17-22.—25. Lankester. “Notes on some Habits of Scorpions,” Journ. Linn. Soc. Zool. vol. xvi. p. 455, 1882.—26. Huxley. “Pharynx of Scorpion,” Quart. Journ. Micr. Sci. vol. viii. (old series) 1860, p. 250. — 27. Pocock. “How and Why Scorpions hiss,” Natural Science, vol. ix. 1896. Cf. idem. “ Stridulating Organs of Spiders,” Ann. and Mag. Nat. Hist. (6), xvi. pp. 230-233.—28. Das Thierreich {Scorpiones et Pedipalpi), Berlin, Fig. 78.—Holothyrus nitidissimus, one of the Acari; after Thorell. En- Kraepolin. larged fifteen times linear. A, lateral view with appendages III to VI 1899.—Peters. “Eine neue Eintheilung der Skorpione,” J/ow. removed; 1, plate covering the whole dorsal area, representing the fused Akad. Wiss. Berlin, 1861.—Pocock. “ Classification of Scorpions,” tergal sclerites of the prosoma and opisthosoma ; 2, similarly-formed ventral and Mag. Nat. Hist. (6) xii. 1893.—Thorell and Lindstrom. plate; 3, tracheal stigma. B, dorsal view of the same animal; II to VI, Ann. second to sixth pairs of appendages. The first pair of appendages both in “ On a Silurian Scorpion,” Acra^. Svens. Vet. Akad. Handl. xxi. No. this and in 0 are retracted. C, ventral view of the same ; II to VI as in B; 9,1885.-29. Cambridge, O. P. “A New Family (Tartarides) and a, genital orifice ; 6, anus; c, united basal segments of the second pair of Genus of Thelyphonidea,” Ann. and Mag. Nat. Hist. (4) x. 1872, appendages; d, basal segment of the sixth prosomatic appendage of the p. 413.—Cook. “Hubbardia, a New Genus of Pedipalpi,” right side. The rest of the appendage, as also of app. Ill, IV, and V, has Proc. Entom. Soc. Washington, vol. iv. 1899.—Kraepolin. Das been cut away. (Original drawing by Pocock and Pickard-Cambridge.) Thierreich. Berlin, 1899.—Thorell. “Tartarides, &c.” Ann. The itch-insect (Sarcoptes scabiei) is a well-known human parasite, Mus. Genova, vol. xxvii. 1889.—30. M'Cook. American Spiders so minute that it was not discovered until the end of the and their Work, 3 vols. Philadelphia, 1889-93.—31. 18th century, and “the itch ” was treated medicinally as a rash. Peckham. Spinning “On Sexual Selection in Spiders,” Occasional The female burrows in the epidermis much as the female Trap-door Papers Nat. Hist. Soc. Wisconsin, vol. i. pp. 1-113, 1889.—32. Spider burrows in turf in order to make a nest in which to rear her Hunting Ants and Trap-Door Spiders, 1873.—33. young. The male does not burrow, but wanders freely on the Moggridge. Bertkau. Arch. f. Naturgesch. vol. xlviii. pp. 316-62.—Idem. surface of the skin. Demodex folliculorum is also a common Same journal, 1875, p. 235, and 1878, p. 351.—Cambridge, O. P. parasite of the sebaceous glands of the skin of the face in man, and “Araneidea” in Biologia Centr. Americana, vols. i. and ii. is frequent in the skin of the dog. Many Acari are parasitic on London, 1899.— Spinnen Amerikas. Nurnberg, marine and freshwater molluscs, and others are found on the 1880-92.—Pocock.Keyserling. Liphistius and the Classification of Spiders,” feathers of birds and the hair of mammals. Others have a special Ann. and Mag. Nat.“ Hist. (6) x. 1892.—Simon. Hist. nat. des faculty of consuming dry, powdery vegetable and animal refuse, and Araigndes, vols. i. and ii. 1892, “L’industrie are liable to multiply in manufactured products of this nature, des Araneina,” Mem. Acad. St. 1897.—Wagner. Petersbourg.—Idem. “La mue such as mouldy cheese. A species of Acarus is recorded as infesting des Araignees,” Ann. Sci. Nat. vol. vi.—34. Grassi. “Intorno a store of powdered strychnine and feeding on that drug, so ad un nuovo Aracnide artrogastro (Kcenenia mirabilis), &c.” Boll. poisonous to larger organisms. Reference to literature (40). Soc. Ent. Ital. vol. xviii. 1886.—35. Hansen and Sorensen. Atjthokities cited by numbers in the text. — 1. Straus- “ The Order Palpigradi, Thorell (Koenenia), and its Relationships Durkheim (as reported by MM. Riester and Sanson in an with other Arachnida,” Ent. Tidskr. vol. xviii. pp. 233-240, appendix to the sixth volume of the French translation of 1898.—Kraepolin. Das Thierreich. Berlin, 1901.—36. Bernard! Meekers 1829).—2. Lankester. “ Limulus an Arach- “Compar. Morphol. of the Galeodidse,” Trans. Linn. Soc. Zool. nid,” Quart. Journ. Micr. Sci. vol. xxi. FT.S. 1881. — 3. vol. vi. 1896, ibique citata.—Dufour. “Galeodes,” Mem. pres. Idem. ‘ ‘ On the Skeletotrophic Tissues of Limulus, Scorpio, and Acad. Sci. Paris, vol. xvii. 1862.—Kraepolin. Das Thierreich. Mygale,” Quart. Journ. Micr. Sci. vol. xxiv. N.S. 1884.—4. Berlin, 1901.—Pocock. “Taxonomy of Solifugse,” Ann. and Idetn. Trans. Zool. Soc. vol. xi. 1883.—5. Lankester and Mag. Nat. Hist. vol. xx.—37. Balzam. “Voyage au Venezuela Bourne. “Eyes of Limulus and Scorpio,” Quart. Journ. Micr. (Pseudoscorpiones),” Ann. Soc. Entom. France, 1891, pp. 497-522. Sci. vol. xxiii. N.S. Jan. 1883.—6. Milne - Edwards, A. —38. Guerin-Meneville. Rev. Zool. 1838, p. 11.—Karsch! “Recherches sur I’anatomie des Limules,” Ann. Sci. Nat. 5th “Ueber Cryptostemma Guer.” Berliner Entom. Zeitschrift, series, ifoofog'fe, vol. xvii. 1873.—7. Owen, Richard. “Anatomy xxxviii. pp. 25-32, 1892.—Thorell. “On an apparently new ot the King-Crab,” Trans. Linn. Soc. Lond. vol. xxviii. 1872.— Arachnid belonging to the family Gryptostemmidce’ Westv. 8. Kishinouye. “ Development of Lvmulus longispina.,” Journal Bihang Svenska Vet. Akad. Handligar, vol. xvii. No. 9, 1892. of the Science College of Japan, vol. v. 1892.—9. Brauer. “De- —39. Sorensen. “ Opiliones laniatores,” Nat. Tidskr. (3) velopment of Scorpion,” Zeitschrift fur wiss. Zoologie, vol. lix. vol. xiv. 1884.—Thorell. “Opilioni,” Ann. Mns. Genova, 1895. —10. Hansen. “Organs and Characters in Different vol. viii. 1876.—40. Berlese. “Acari, &c., in Italia reperti.” Orders of Arachnida, ” Entomol. Meddel. vol. iv. pp. 137-149. Padova, 1892.—Canestroni. Acarofauna Italiana. Padova, ■ 11. Watase. “ On the Morphology of the Compound Eyes 1885.—Canestroni and Kramer. “ Demodicidse and Sarof Arthropods,” Studies from the Biolog. Lab. Johns Hopkins copti&di" in Das Thierreich. Berlin, 1899.—Michael. “British University, vol.. iv. pp. 287 - 334. —12, Newport, George. Oribatidse, ” Ray Soc.—Idem. “Oribatidae” in Das Thierreich. “Nervous and Circulatory Systems inMyriapoda and Macrourous Berlin, 1898.—Idem. “Progress and Present State of KnowArachnids,” Phil. Trans. Roy. Soc. 1843.—13. Lankester. ledge of Acari,” Journ. Roy. Micr. Soc. 1894.—Nalepa. “Coxal Glands of Limulus, Scorpio, and Mygale,” Quart. Journ. “ Phytoptidae,” Das Thierreich. Berlin, 1898.— Trouessart. S. I. — 69