Cope.] ~ '^^^ [Feb. 5. 



Elasmobranciui. 

 Lamna elegans. 

 Lamna cuspidata. 

 Lamna denticulata. 

 oxyrhina xiphodon. 

 oxyrhina mintjta. 



Otodus APPENDICULATTJS. 



Carcharodon megalodon. 

 Carcharodon angustidens. 

 Hemipristis serra. 

 Zygaena peisca. 

 Galeocerdo adunctjs. 



GaLEOCERDO EGERTONir. 



notidaisius primigenius. 



Aetobatis sp. 



Myliobatis sp. 



Zygobatis sp, 



Plinthicus stenodon, Cope, Proceed, Boston Soc. Nat, History, 1867, 



p, 316. 

 Pristis amblodon, Cope, ibidem, 312, 



ACTINOTERI, 



Phyllodus curvidens, Marsh, Proceed. Amer. Assoc, Adv, Science, 



1870, p. 229. 

 Orommyodus irregularis, Cope, Proceed. Amer, Philos, Society, 1869, 



p, 243; Proceed. Boston Soc. Nat. History, 1869, p. 311. 

 Thasganodus gentryi. Cope, sp. nov. 



Represented by one of the long teeth of the anterior part of the jaws. 

 It is slender and curved baekwai'd, and the anterior view presents a cut- 

 ting edge fron the apex to the base ; there is no cutting edge nor angle 

 on the posterior face, unless it be at the apex, which is broken off in the 

 specimen. On one side the cementum is smooth ; on the other, and 

 posteriorly, the crown is keeled-striate from the base to near the apex. 

 Length pi-eserved, .010; long diameter at base, .0022; do. near apex, 

 .0020 ; short diameter at base, .0012. Dedicated to my friend Thomas 

 0. Gentry, of Philadelphia, an acute observer of nature. 

 Spyraenodus speciosus, Leidy, Sphyl^aena speciosa, Leidy, Proceed, 



Acad, Nat, Sciences, 1856, p, 221, 

 Sphyraenodtjs silovianus, Cope, sp. nov. 



Represented principally by a portion of the dentary bone, supporting 

 five teeth, and containing alveoli for four others. The jaw is compressed 

 and slightly curved and with smooth surface. The teeth are subequal, 

 compressed, rather short and acute, and without roots ; at their bases 

 the alveolar borders are notched. Length of fragment, ,020 ; depth at 

 middle, .004 ; length of a tooth, ,003 ; long diameter at base, .002. 



