80 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



990. Trionyx foveatus Leidy. Cotype. 



Costal plate. Laramie (Cretaceous). Long Lake, Ne- 

 braska. 



Leidy, Proc. Acad. Nat. Sci. Phila., VIII, 1856, p. 73; Trans. Atner. 

 Phil. Soc, XI, i860, p. 148, pi. 11, fig. 3. 



96. Trionyx guttatus Leidy. Type. 



Part of carapace. Bridger (Eocene). Church Buttes, Uinta 

 County, Wyoming, 



Leidy, Proc. Acad. Nat. Sci. Phila., 1869, p. 66; Rept. U. S. Geol. 

 Surv. Terr., I, 1873, P- J 76, pi- 9, fig. 1 



1 1 13. Trionyx leptomitus Cope. Type. 



Part of carapace. Wasatch (Eocene). New Mexico. 



Cope, Rept. to Engin. Dept. U. S. A., 1875, p. 35; Rept. U. S. Geogr. 

 Surv. W. 100th Merid., IV, Pt. II, 1877, p. 44, pi. 26, rigs. 1-3. 



1 1 10. Trionyx leptomitus Cope. Paratypes. 



5366. (1) Parts of carapace; (2) right hyposternal. Wasatch 



(Eocene). New Mexico. 



Cope, Rept. to Engin. Dept. U. S. A., 1875, p. 35; Rept. U. S. Geogr. 

 Surv. W. 100th Merid. IV, Pt. II, 1877, p. 44, (1) pi. 25, figs. 27- 

 31; (2) pi. 26, fig. 4 



2581. Trionyx radulus Cope. Type. 



Portions of costal and dorsal plates. Wasatch (Eocene). 

 Gallinas River, New Mexico. 



Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 35; Rept. U. S. 

 Geogr. Surv. W. 100th Merid., IV, Pt. II, 1877, p. 45, pi. 26, figs. 

 11-16. 



2358. Trionyx vagans Cope. Type. 



Costal bones. Laramie (Cretaceous). Colorado. 



Cope, Ann. Rept. Geol. and Geogr. Surv. Terr, for 1873, 1874, 

 P- 453- 



1 1 12. Trionyx ventricosus Cope. Cotypes. 



5460. (1) Parts of carapace; (2) left hyposternal. Wasatch (Eo- 



cene.) New Mexico. 



Cope, Rept. U. S. Geogr. Surv. W. 100th Merid., IV, Pt. II, 1877, p. 

 45, pi. 64, figs. 7, 11-12. 



977. Trionyx sp. undet. 



Costal plate. Eocene. Little Sand)' Creek, Wyoming. 

 Leidy, Rept. U. S. Geol. Surv. Terr., I, 1873, pi. 16, fig. 12. 



41. Tylosaurus dyspelor (Cope). Type. 



Leidy, Rept. U. S. Geol. Surv. Terr., I, 1873, p. 271, pi. 35, figs. 

 1-11; pi. 36, fig. 16. 



See Liodon dyspelor. 



43. Tylosaurus proriger (Cope). Plesiotypes. 



3885. (1) Caudal vertebra; (2) tooth; (3) fragments of jaw and 



3891. splenial bone; (4) extremity of snout. Niobrara (Cre- 



3894. taceous). Smoky Hill River, Kansas. 



Leidy, Rept. U. S. Geol. Surv/Terr., I, 1873, p. 274, (1) pi. 36, 

 figs. 1, 2; (2) fig. 3; (3) pi. 35, fig. 13; (4) pi. 35, fig. 12. 



