414 EXTINCT MAMMALIA OF NORTH AMERICA. 



Avlaxodnn s. Pleurodon, in part of Harlan : Am. Jour. Sc. 1842, XLHI, 141. 

 Euhradys antiqwis, Leidy : Proc. Ac. Nat. Sc. 1852, 117 ; 18.53, 241. 



All the remains oi Mylodon heretofore discovered in North America appear to be- 

 long to this species. Quaternary. 



Of uncertain reference. 



Extinct genua of the Edentate order, Hale : Am. Jour. Sc. 1848, VI, 357. 



Skull from Claiborne Bluff, Alabama. Eocene. Probably a squalodont ? 



SIRENIA. 



MANATUS. 



Manatus antiqnns. 



Manatus, Tuomey: Rep. Geol. S. Carol. 1848, 165, 166, 208. Gibbes : Pr. Am. Assoc. 1849, II, 



193 ; 1850, III, 66. Pictet : Traits de Paleont. 1853, I, 872. 

 Manaius antiq^tus, Leidy: Proc. Ac. Nat. Sc. 1856, 165; Holmes' Post-plioc. Fos. S. Carol. 1860, 



117, PL XXIV, Figs. 5—7. 



Indicated by remains in the post-pliocene formation of Ashley River, South 

 Carolina. 



Remains of nnoertain reference. 



Manatus, Harlan : Jour. Acad. Nat. Sc. 1825, 236 ; Edinb. New. Phil. Jour. 1834, XVII, 361 ; 



Trans. Geol. Soc. Peuu. 1835,73; Med. Phys. Res. 1835, 278, 385. Meyer: Palajologica. 



1832, 98. Smith : Am. Jour. Sc. 1844, XLVII, 116. Allen : Ibid. 1846, I, 41. Leidy : Anc. 



Fauna Neb. 1853, 10. Cope : Proc. Ac. Nat. Sc. 1867, 138. 

 Manatus giganieus, DeKay : Nat. Hist. N. York, Zool. 1842, I, 123. 

 Manatus americanus fossilis, Harlan : fide Pictet's Traite de Paleont. 1853, I, 372. 



Harlan mentions two vertebrje of a gigantic species from the western shore of 

 Maryland, and also a rib from the same locality. I have seen fragments of ribs and 

 vertebrte of a Manatus from the miocene and later formations of New Jersey, Vir- 

 ginia, North Carolina, and Florida. Prof. Cope recently noticed remains from the 

 post-pliocene formation of Charles Co., Maryland. 



PRORASTOMUS. 



Prorastomus sirenoides. 



Owen : Quart. Jour. Geol. Soc. Lond. 1855, XL 541, PI. XV. 



Remains found in the Island of Jamaica. Tertiary. 



ISCHTROTHERIUM ANTIQWUM. 



Ischyrotherium antiquus, Leidy: Proc. Acad. Nat. Sc. 18.'i6, 89. /. antiquum, Leidy: Trans. Am. Phil. 



Soc. 1859, XI, 150, PI. XX, Figs. 8-17. 

 Ischyrosaurus antiquus. Cope : Trans. «lm. Phil. Soc. 1869, XIV, 38, 39. 

 The remains originally referred to a sirenian with the above name, but at the same time suspected to belong 

 to a reptile, I have not introduced into the synopsis of mammals, as I have latterly viewed them as reptilian. 

 The anatomical characters of the specimens, for the most part, are peculiar, but are more related with those of 

 reptiles than of mammals. 



