41G EXTINCT MAMMALIA OF NORTH AMERICA. 



vicinity of Burlington, New Jersey. The specimen purports to have been derived 

 from tlic green sand, but is probably of miocene age and accidental in its position in 

 relation with the preceding formation. 



The original of the tooth I have not seen, but it was in possession of Timothy 

 Conrad, the well-known naturalist, who made an outline drawing of it the size of 

 nature, which is represented in a wood-cut, of the same size, on page 377 of the Pro- 

 ceedings of this Academy for 1853. The specimen has been lost. The drawing of it 

 so nearly resembles the representations of the molar teeth of the Crab-eating Seal, 

 Lobodon carcinopliaga of Gray, or the Stenorhynchus serridens of Owen, that it may 

 be regarded as an indication of an extinct species of the same genus. 



Of uncertain reference. 



Seal allied to Cystophova prohoscldea, Owen : Am. Jour. Sc. 1844, XLVI, 319. 



From Martha's Vineyard, Massachusetts. 

 Seal from Newhern, N. C, Harlan : Am. Jour. Sc. 1842, XLIII, 143. 



TEICHECHIDJE. 



TRICHECHUS. 

 Tricheclius rosmams. 



Barton : Philos. Mag. London, 1805. XXXII, 98. Mitchell, etc. : Edinb. New Phil. Jour. 1828, 

 V, 825. Harlan : Edinb. New Phil. Jour. 1834, XVII, 360 ; Trans. Geol. Soc. Penn. 1835, 

 I, 72 ; Med. Phys. Res. 1835, 277. Leidy: Trans. Am. Phil. Soc. 1857, XI, Pis. IV, V, 

 Fig. 1. 



Morse, or Walrus, Mitchell, etc.: An. Lye. Nat. Hist. New York, 1828, IL 271. Lyell : Am. 

 Jour. Sc. 1844, XLVI, 319. Different from existing species, Owen : Proc. Geol. Soc. London, 

 1843, IV, 32 ; Am. Jour. Sc. 1844, XLVI, 319. Pictet : Paleont. 1844, 1, 189 ; 1853, 1, 233. 

 Agassiz : Proc. Am. As. Adv. Sc. 1851, 251, 348. 



Trichecus, Bleyer : Palreologica, 1832, 55, in part. 



Trichecus Virginianus, Dekay : Nat. Hist. New York, Zool. 1842, 1, 56, PI. XIX, Figs. 1 a, h. 



Remains of the Walrus, not characteristically distinct from the corresponding parts 

 of the existing animal have been found in superficial deposits of Martha's Vineyard, 

 Massachusetts, Monmouth County, New Jersey, and Accomac County, Virginia. 



ZEUGLODONTES. 



SQUALODON. 



Sqnalodon atlanticns. 



Macrophoca atlantica, Leidy : Proc. Ac. Nat. Sc. 1856, 220. 



Sqiialodon atlanticus, Leidy: Cope's Ad. to the Verteb. Fauna of the Mioc. Per., Proc. Acad. Nat. 

 Sc. 1867, 132, 144, 151, 153. 



A species indicated by three molar teeth, represented in figs. 4 — 7, plate XXVIII, 



