434 EXTINCT MAMMALIA OF NORTH AMERICA. 



TRETOSPIIYS. 



Tretospliys grandsexms. 



J^nscodelphinus grandcmnts, Leidy : Proc. Acad. Nat. Sc. 1851, 327 ; 1853, 377 ; Anc. Fauna Neb. 



1853, 8 ; Cret. Rept. U. S., in Sniitlia. Trans. 1865, 1, note. Dana : Man. Geology, 18G3, 478. 



Cope : Proc. Ac. Nat. Sc. 1867, 144. 

 Delphinaiytcrus grcmdmmis, Cope : Proc. Ac. Nat. Sc. 1868, 191. 

 T. grandcBvus, Cope : Proc. Ac. Nat. Sc. 1868, 191. 

 Tretospliys grandctivus, Cope : Proc. Ac. Nat. Sc. 1869, 6, 7, 8. 



This species was originally indicated by two vertebrae from the miocene marl beds 

 of Shiloh, Cumberland Co., N. J. The specimens are without epiphyses, and appear 

 related to a larger dorsal vertebra than that referred to Priscodelphinus Harlani, and 

 were therefore supposed to indicate a different species. There is no positive evi- 

 dence that they belonged to the same genus, their reference in this respect having 

 been made on their general relation in length and on the supposition that they be- 

 longed, together with the vertebra of P. Harlani, to the cretaceous green sand. 



Mature specimens of vertebrae, apparently of the same species, have since been 

 obtained from the same locality. The body of an adult lumbar vertebra measures 

 two and three-quarter inches in length, and at the articular ends rather less than two 

 and a quarter inches in breadth. 



The fragment of an upper jaw accompanying two of the vertebral specimens is 

 suspected to belong to the same animal, and indicates it to have possessed a long, 

 narrow muzzle. The fragment is about a foot in length ; at the back part is twenty- 

 three lines wide and thirteen and a half lines in depth ; at the fore part it is fifteen 

 lines wide and nine lines in depth. A fissure divides it in the median line, widening 

 into a narrow angular groove below, and closed at its fore part above. The under 

 surface is transversely conve.K, and impressed into a shallow groove along the line of 

 the sockets of the teeth, which are twenty-two in number in the space of a foot. The 

 upper part is prominently convex, declining anteriorly and strongly impressed at the 

 sides. No teeth remain in the specimen. 



Tretospliys lacertosus. 



Delphmaj)terus lacertosus, Cope : Proc. Ac. Nat. Sc. 1868, 190. 

 T. lacertosus, Cope : Proc. Ac. Nat. Sc. 1868, 189. 

 Tretospliys, Cope : Proc. Ac. Nat. Sc. 1868, 190. 

 Delphinapterus SarvJcinsii, Cope : Ibidem. 

 Tretospliys lacertosus, Cope : Proc. Ac. Nat. Sc. 1869, 7. 



Remains from the miocene of Charles Co., Md. 



Tretospliys Gabbii. 



Dclplunaptcrus Gahhil, Cope: Proc. Ac. Nat. Sc. 1868, 191. 



T. Gahhil, Cope : Ibidem. 



Trvtosphys Gahbil, Cope : Proc. Ac. Nat. Sc. 1869, 7, 8. 



Founded on a caudal vertebra from the miocene of Charles Co., Md. 



