2l6 



FOSSIL TURTLES OF NORTH AMKRICA. 



longiceps the type of Puppigeru s, and the latter is not congeneric with Chelonia grandceva, this 

 species can not be placed under Puppigerus. 



A study of the known materials of Chelonia grandceva makes it apparent that the first 

 costal bone was articulated with the nuchal and the first peripheral of each side and that some 

 of the costals were articulated proximally with 3 neurals each. In these respects the species 

 differs from any belonging to either Chelonia, Eretmochelys, or Caretta. 



As regards the relations of the costals to the neurals, we find similar conditions in a spec- 

 imen of Colpochelys kempi in the American Museum of Natural History. In this there are 

 apparently 13 neurals, and the costals of the third, fourth, fifth and sixth pairs articulate each 

 with 3 of these neurals. Nevertheless, nearly all the neurals are hexagonal, none octagonal, 

 as in Testudo, where some costals articulate with 3 neurals. 



On a comparison of the widths of the costals with the lengths of the neurals we find a 

 confirmation of the conclusion that there were, as in Colpochelys, more than 8 neurals. 



But while agreeing with Colpochelys in these respects Procolpochelys differs from it in 

 another. In Colpochelys the end of the rib of the first costal bone enters a pit in the fourth 

 or fifth peripheral, while in Procolpochelys grandceva, as in most Chelonndae, the end of the 

 first costal rib enters a pit in the third peripheral. 



Procolpochelys is therefore distinguish! from all the hitherto recognized genera of Che- 

 loniidae. 



On pages 8, 9, and 10 Colpochelys kempi has been referred! to'jthe] genus Lepidochelys. 



\J 



274. 



FIGS. 273 AND 274. Procolpochelys grandceva. Neurals. X<f. 

 273. Two neural bones. Type. 274. Neural. No. 1017 A. M. N. H. 



Procolpochelys grandaeva (Leidy). 

 Figs. 273-280. 



Chelonia grandceva, LEIDY, Proc. Acad. Nat. Sci. Phila., v, 1851, p. 329; Ibid., vm, 1856, p. 303. 

 COPE, Cook's Geol. New Jersey, 1868 (1869), p. 738; Ext. Batrach., Reptilia, and Aves N. A., 

 1870, p. 153, figs. 40, 41. MAACK, Palaeontographica, xvm, 1869, p. 283. 



Puppigerus grandtevus, COPE, Ext. Batrach., etc., 1870, p. 235; Proc. Amer. Philos. Soc., xiv, 1875, p. 

 363. HAY, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 443. 



Dr. Leidy's Chelonia grandceva is an insufficiently known species. The type belongs to 

 the Philadelphia Academy. It consists of three neural bones which had been found in what 

 is regarded as Miocene marl, in Salem County, New Jersey. One of these neurals appeared 

 to Leidy to be the first. A portion of the anterior end had been broken off, yet the part 

 that remained was 67 mm. long and 48 mm. wide. The other two neurals were hexagonal, 

 as wide as long or wider, and each had a posterior process, showing that some of the neurals 

 were sharply notcht in front. One of these (fig. 273, a) was 54 mm. long, 67 mm. wide, and 

 15.5 mm. thick; the other (fig. 273, b) was 58 mm. long, including the process, and 58 mm. wide. 



Cope, in 1870, as cited, further described the species. He had some fragments of costals; 

 a fragment of probably the nuchal; the scapula, which he figured; and what he described as 

 the femur, but which was evidently the humerus, as indeed he says it was in his explanation 



