Page:Synopsis of the Exinct Batrachia and Reptilia of North America. Part 1..pdf/73

 AND AVES OF NORTH AMP RICA. 67 In. Lin. Length of portion of femur, 11 Largest diameter below head, 2 11.25 Convex extent of head, 4 G. Ciremnferenee of shaft, 4 9. Diameter of tibia two inches below head, 1 10. Length of eondyles of humerus, 2 9. Diameter of inner eoudyle, 1 10. •; region between. eondyles, 1 0. shaft 2.5 inches above eondyles, 1 4. Greatest diameter of bead of rib, Second—A fifth eervical, two lumbars and fragments of long bones from Birmingham, N. J. The cervical is eon-.siderably larger than the last, and has the arches eoossified ; its total length is 34/ lines, and is appropriate to the adult condition of this animal. The lumbars indicate thither the difference between this species and the Hol. obscurus. The cups and shoulder are more expanded latterly than in any species here enumerated, even near the saerum, and the centrum more depressed, and with concave sides. A very obtuse rib extends along the inferior face. Total length, Length to shoulder, Width of cup, " shoulder, 3.85 2.3 1.76 1.76 Both of these specimens represent the Crocodiles basitnowatu,s of Owen, and should their reference to the Bottosaurus by Leidy wove erroneous, will indicate a species under that specific name. From the Cretaceous greensand of New Jersey. HOLOPS, Cope. This genus, which appears to differ from Thoracosaurus only in the absence of lach-rymal fossae, has probably been represented by several species during the Cretaceous period in New Jersey. Vertebrae of two species have been described by Leidy as pertaining to the genus Crocodilus. All of them differ from the species of the existing six genera of Crocodilidie in the absence of elongate hypapophyses on the cervical vertebrae, and their replacement by lifted or simple often transverse tuberosities. As observed by Leidy, the T. macrorhynchus from the cretaceous of France presents a similar character. The student should also notice that in this genus the axis is the longest vertebra, and the third cervical the most constricted. The third cervical vertebra, as well as the axis, is also in Alligator mississippiensis and Crocodilus biporcatus slightly more constricted than the succeeding lertebra. The cups widen above to the fourth dorsal ; from this point to the sixth the centra narrow rapidly, presenting more difference than in the same distance elsewhere. The eighth begins to widen again, though. still narrowed.