Page:Encyclopædia Britannica, Ninth Edition, v. 23.djvu/59

Rh elevated peak of rock, and commands one of the most magnificent views in the world, with Mount Etna in the distance. Remains of five piscinæ and a large bath, popularly called a naumachia, still exist, together with remains of the ancient city wall and that of the arx.

 TAPACULO, the name given in Chili to a bird of singular appearance,—the Pteroptochus albicollis of ornithology,—and, throughout this series of articles (, vol. iii. p. 743;, vol. xviii. p. 40, et alibi), applied in an extended sense to its allied forms, which are now found to constitute a small Family, Pteroptochidæ, belonging to the Tracheophonous division of Passeres, and therefore peculiar to South America. About 20 species, which are disposed by Mr Sclater (Ibis, 1874, pp, 189–206) in 8 genera, are believed to belong to this group. Tapaculo.

The true Tapaculo (P. albicollis) has a general resemblance in plumage to the females of some of the smaller Shrikes (Lanius), and to a cursory observer its skin might pass for that of one; but its shortened wings and powerful feet would on closer inspection at once reveal the difference. In life, however, its appearance must be wholly unlike, for it rarely flies, hops actively on the ground or among bushes, with its tail erect or turned towards its head, and continually utters various and strange notes,—some, says Mr Darwin, are "like the cooing of doves, others like the bubbling of water, and many defy all similes." The "Turco," Hylactes megapodius, is larger, with greatly developed feet and claws, but is very similar in colour and habits. Two more species of Hylactes are known, and one other of Pteroptochus, all of which are peculiar to Chili or Patagonia. The species of Scytalopus are as small as Wrens, mostly of a dark colour, and inhabit parts of Brazil and Colombia, one of them occurring so far northward as Bogota.  TAPESTRY.See.  TAPE-WORMS, or, are a group of worms forming one of the three main divisions of the Platyhelminthes, the other two being the Turbellaria (see and ) and Trematoda (see ). They have been defined as follows:—"Flat worms without mouth or alimentary canal, which typically develop by alternation of generations, by budding from a generally pear-shaped nurse, with which they remain united for a lengthened period as a ribbon-like colony or 'strobila.' The individual joints of the colony, i.e., the sexual animals or 'proglottides,' increase in size and maturity as they are removed farther from their origin by the intercalation of new buds, but are not distinguished in any special way. The nurse, however, known by the name of the 'head' (scolex) is provided with four or two suckers, and usually with curved claw-like hooks. The dorsal and ventral surfaces of the head are perfectly identical, so that the arrangement of the hooks presents a strikingly radiate appearance. By means of this apparatus the worms fasten themselves on the intestinal membrane of their hosts, which (except in the case of the otherwise peculiar Archigetes) all belong to the Vertebrata. The nurses develop from little round six-hooked embryos in a more or less complicated fashion as so-called 'bladder-worms.' The latter inhabit very diverse, but usually parenchymatous, organs of the higher and lower animals, and are thence passively transferred to the intestine of their subsequent host" (Leuckart, 1, p. 270).

Historical Sketch.—Certain forms of Cestodes have been known from time immemorial. The hydatid cyst is alluded to by early medical writers, and Aristotle speaks of examining the tongue of pigs to ascertain the presence of bladder-worms. By this author and Hippocrates the Cestodes and other flat worms are spoken of as ἕλμινθες λατειαι, in opposition to the στρογγύλι or "round worms"; the word Tænia (Gr. ταινία) does not occur in Greek authors, but is first used by the Romans (Pliny, H. N., xi. 33). In the treatises of the Middle Ages the tape-worm figured as Lumbricus latus, only one species being recognized. Felix Plater (23) separated Bothriocephalus from the other human tape-worms, and Andry (24) gave it the name Ténia à épine, mistaking the nodular generative organs for vertebræ. The appellation Bothriocephalus latus dates from Bremser, 1819 (25). Like other Entozoa, the tape-worms and bladder-worms were supposed to arise by spontaneous generation; it was found, however, that animal forms strikingly like the Entozoa sometimes lived freely. Pallas (19), seeing that the eggs of intestinal worms are expelled from the animals in which they live, and may remain for some time unaltered in water, suggested the hypothesis that the Entozoa agree with other animals in originating from eggs which can be

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