[68 



FOSSIL TURTLES OF NORTH AMERICA. 

 Key to Species of Toxochelys. 



A. Species based on skull. 



a. Symphysis of lower jaw short, about one-fifth of length of lower crushing-surface of jaw. 

 b. Snout rather pointed. 



c. Jaws slender and weak; symphysis thin, sloping on upper surface latiremis 



cc. Jaw rather heavy; the upper surface of the symphysis horizontal serrijer 



bb. Snout broad and rounded brachyrhma 



,i<i. Symphysis long, at least one-third the length of the crushing-surface. 



d. Nasal opening narrow; upper surface of the symphysis sloping stenopora 



dd. Nasal opening normal; symphysis flat above. 



e. Skull as broad as long elkader 



ce. Skull longer than broad procax 



A A. Species based on shell only baurt 



FlGS. 202-205. Toxochelys latir 



Skulls and lower jaw. X5. 



202. Upper view of front of skull. No. 1406 A. M. N. H. 



203. Upper view of skull. No. 1497 A. M. N. H. at, atlas; ax, axis; sq, squamosal. 



204. Lower view of same skull as preceding, at, atlas; ax, axis', qu, quadrate; sq, squamosal. 



205. Dcntarv portion of lower jaw, with section along the symphysis. No. 1497 A. M. N. H. 



Toxochelys latiremis Cope 

 Figs. 200, 202-206. 



Toxochelys latiremis, Cope. Proc. Acad. Nat. Sci. Phila. 1873, p. 10; Vert. Cret. Form. West, 1875, 

 pp. 98, 260, pi. viii, figs. 1, 2; Proc. Amer. Fhilos. Soc, xvn, 1877, p. 176. Hay, Pubs. Held 

 Columb. Mas., Zool., I, 1896, p. 101, pis. xiv, xv; Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 442; 

 Bull. Amer. Mus. Nat. Hist., xxi, 1905, p. 177. Case, Univ. Kansas Geol. Surv., iv, 1898, p. 371, 

 plate lxxix; plate Ixxx, figs. 1, 2; rplate lxxxi, figs. 1-8, 10-13; ?plate lxxxii, figs. I, 2; plate Ixxxiii, 

 figs. 2-4. Wagner, Kansas Univ. Quarterly, vn, A, 1898, p. 201, fig. 1. Wieland, Amer. Jour. 

 Sci. (4), xiv, 1902, p. 95, figs. 1, 2. 



Cynocercus tncisus, Leidy, Cont. Ext. Vert. Fauna West. Terrs., 1873, p. 279, plate xxxvi, figs. 17-21. 



The type of the present species consists of a portion of the lower jaw and a coracoid, of 

 the Cope collection of reptiles and fishes, and is now in the American Museum of Natural 

 History, New York, having the number 2362. The specimen was collected by Professor 



