FOSSIL REMAINS. 473 



Squalodon*, of which he says: "Of this, the smallest species 

 of the genus, three premolar teeth are in the collection [made 

 by Mr. James T. Thomas, in Charles County, Maryland from 

 beds of the Yorktown epoch], and the type specimen [Dr. 

 LeidyV?] is in the Academy's Museum. The teeth are re- 

 markable for the abrupt posterior direction of their crowns. 

 The roots are curved, one of them abruptly so, and flattened." 



The Squalodon wymani of Cope thus, inferentially at least, 

 includes the remains described by Wyman, though direct refer- 

 ence seems to be made only to the tooth referred by Leidy to 

 his Phoca wymani in 1856, and which is that of a Squalodont. 

 The Phoca wymani, if not originally a composite species, as was 

 in all probability the case, certainly became so in 1856. In 1869 

 Dr. Leidy retained, under the name Phoca wymani, the speci- 

 mens above mentioned as described by Wyman in 1850, sepa- 

 rating the tooth referred by him to this species in 1856 under 

 the name Delphinodon wymanii 



2. "Phoca deMUs". In 1856 Dr. Leidy gave a description 

 of his Phoca debilis, of which the following is a transcript in 

 full : "A species of Seal is apparently indicated by three speci- 

 mens of molar teeth obtained by Capt. Bowman, U. S. A., from 

 the sands of the Ashley Eiver, South Carolina. The teeth bear 

 considerable resemblance to the corresponding ones of Otaria 

 jubata, having small, compressed conical crowns, tuberculate in 

 front and behind, and single, long, gibbous fangs. The small- 

 est specimen is 5.J lines long, and the largest, when perfect, was 

 about an inch long". 



In 1867 this species was referred by Professor Cope to Squa- 

 lodon, who says : "A species still smaller than S. wymanii has 

 been described by Leidy as Phoca debilis, from the Pliocene of 

 Ashley Eiver of S. Carolina. It will no doubt be found to be 

 allied to Squalodon ". It had, in fact, been apparently already 

 referred by Cope in the early part of the same paper to Squal- 

 odon, where (on page 144) he gives, in his list of species, " Squal- 

 odon debilis Cope, Pliocene". Dr. Leidy himself, in 1869, ad- 

 mitted that Professor Cope's suspicions of their Squalodont 

 affinities might be correct, but adds that these teeth "may 

 belong to a Dolphin ".|| 



* " Squalodon wymanii m. Phoca wymanii Leidy. Proceedings Academy 

 N. Sci., 1856, 265." Proc. Acad. Nat. Sci. Phila., 1867, p. 152. 

 tExt. Mam. N. Amer., p. 426. 

 JProc. Acad. Nat. Sci. Phila., 1856, p. 265. 

 $ Ibid., 1867, p. 153. 

 || Ext. Mam. N. Am., p. 475. 



