EXTINCT MAMMALIA OF NORTH AMERICA. 433 



PRISCODELPHINUS. 



Priscodelphinns Harlani. 



Pksiosaurus, Harlan : Jour. Acad. Nat. Sc. 1825, 232, PL XIV, Fig. 1 ; Edinb. New Phil. Jour. 



1834, XVIII, 29 ; Trans. Geol. Soc. Penn. 1835, I, 77 ; Med. Phys. Res. 1835, 281. 

 PriscodelpJiinus Earlam, Leidy : Pr. Ac. Nat. Sc. 1851, 327; 1853, 377 ; Anc. Fauna Neb. 1853, 



8 ; Cret. Kept. United States in Smiths. Trans. 1861, 1, note. Dana : Man. Geology, 1863, 



478. Cope: Proc. Ac. Nat. Sc. 1867, 144; 1868, 188. 

 Priscodelphinus, Lyell : Principles of Geol. 1854, 145 ; Man. Elem. Geol. 1855, 256. 



The species is indicated by an isolated vertebra, originally described and figured 

 by Dr. Harlan as pertaining to a Plesiosaurus from the cretaceous green sand of New 

 Jersey. Recognizing its cetacean character, from its reported origin I supposed it to 

 be the first evidence of the existence of cetaceans during the cretaceous period. Later 

 researches prove the fossil to belong to the middle tertiary period. The specimen 

 is a vertebra of mature age, and was obtained at MuUica Hill, Gloucester County, 

 New Jersey. The length of the body is a little over two inches ; the posterior 

 articular surface is twenty lines wide and seventeen in depth. The spinal arch is 

 lost. The width of the spinal canal just within its fore part is nine lines. The 

 length of a transverse process, with an articular facet for a rib, is seventeen 

 lines. 



A less complete dorsal vertebra and four caudals, from their relative proportions 

 supposed to belong to the same species, are from the miocene deposit of Shiloh, Cum- 

 berland Co,, New Jersey, and are preserved in the Museum of the Academy. 



Priscodelphinns Conradi. 



Delphbuts Conradi, Leidy: Proc. Ac. Nat. Sc. 1852, 35. Cope: Ibidem, 1867, 144. 

 Priscodelphinus Conradi, Cope : Proc. Ac. Nat. Sc. 1868, 188. 



Founded on vertebrse from the miocene of Virginia, and Charles Co., Maryland. 



Priscodelphinus acutidens. 



Cope : Proc. Ac. Nat. Sc. 1867, 144, 146. 



Founded on a single tooth from the miocene of Charles Co., Maryland. 



Priscodelphinus spinosns. 



Cope : Proc. Ac. Nat. Sc. 1868, 187. 



Indicated by vertebroD from the miocene formation of Charles Co., Md. 



Priscodelphinus atropius. 



Cope : Proc. Acad. Nat. Sci. 1868, 187, 188. 



Indicated by vertebrce from the miocene formation of Charles Co., Md. 



Priscodelphinus stenus. 



Cope : Proc. Ac. Nat. Sc. 1868, 188. 



Indicated by vertebrae found with the above. 



55 



