i/8 



FOSSIL TURTLES OK NORTH AMERICA. 



Toxochelys bauri Wieland. 

 Figs. 229-230. 

 Toxochelys bauri, Wieland, Atner. (our. Sci., xx, 1905, p. 325, plate x, text-figs. 1-8. 



Up to the present time no better carapace of a Toxochelys has been recovered than that 

 forming the basis of Wieland's 'Toxochelys bauri. This specimen forms No. 2823 of the Yale 

 University collection. It was found in the Niobrara deposits, near Monument Rocks, Gove 

 County, Kansas. It furnishes all the neurals, and the nuchal; large portions of all the costals 

 of the right side, except the fifth; the proximal ends of all the costals of the left side; all the 

 peripherals of the right side, except the fifth to the eighth inclusive; all of those of the left side, 

 except the first three and the seventh, ninth, and eleventh. Of the plastron there is present 

 a considerable part of the right hyoplastron and hypoplastron. A number of Wieland's figures 

 are here reproduced. 



As to the distinctness of this species from all that have hitherto been described there may be 

 doubts, which it is too early to remove. Of two of the described species, T. brachyrhina and 



Fig. 229. Toxochelys bauri. Carapace of the type. X i. 



1 ./-../. 8, first, second and eighth costal plates; /, fontanels behind nuchal; it. I, rt. 2, etc., the neural 

 hone;.; nu. p, nuchal plate; per. 10, the tenth peripheral; py, pygal bone; spy. 1, spy. 2, spy. 3, the 

 suprapygal bones. Or, spv. 1 mav be the ninth neural; spy. 2 and spy. 3, first and second suprapygals. 



T . procax, no portions of the shell are known; and T . bauri may be the shell of one of these. 

 Of T. lata, ini\ only small portions of the shell are known; but to judge from the figures of the 

 nuchal that have been publisht, the species is distinct from T. bauri. The latter appears pretty 

 certainly to be distinct from T. stenopora. Of the carapace of T. serrijer Cope there are known 

 only two peripherals, apparently the eighth and the ninth. These appear to resemble greatly 

 the same peripherals of Wieland's species. They belonged to an individual about half the 

 size of the latter. The eighth of Wieland's type had a length of 80 mm. and a width, at the 

 notch, of +5 mm.; the ninth, a length of 75 mm. and a width of 45 mm. The eighth off. semfer 

 is 41 mm. long and 25 mm. wide; the ninth, 43 mm. long and 27 mm. wide. It will be seen that 



