SPECIES OF MAMMALIA. 



Trichechus, Bodd. Elen. Anim- 173. Rosmarus, Scopili. 

 Odobenus, Lin. Sys.- Nat. ed. 10. 38. Brisson. Rosma- 

 rus, Jonston, Pise. t. 44. Equus Manuiis, Rai., Quad. 191. 

 Mors. Morfo. Rosmarus, Gesner, Aguat. 211. 



WciUruss, Mar te7i. Spits, b. 78. Le Morse, Buffon, /list. 

 Nat. XIII. Sea Elephant. Arctic Wallrus, Shaw's Zool. 



Icon. Hout. Nat. v. t. 11./. 1. Schreb. v. t. 79. Jon- 

 ston. Pise. t. 4. IX. Lev. Mus. t. 23. /. 3. Bonanu. Mus. 

 f. 27. Gesner, Aquat. 211. Ellis^ Hudson, t. 6. f. 3. 

 Marten, Spits, t. \.f. 13. Bujfon, Hist. Nat. xiii. t. 54. 

 Ency. Method, t. 112./. 1. Cook's Third Voyage, iv. /. 8. 

 Shaw's Zool. t.l8. 



Inhab. Northern Ocean. 



The two species proposed by Dr. Shaw, appear to be 

 only varieties. 



Family IV.— MARSUPIATA. 



Teeth varying very considerably in the different subdi- 

 visions; all the species born prematurely, at least in a very 

 early stage of development, and become attached to the 

 mammae of the mother, in a manner not known. The 

 mammas and young of most of the species enclosed 

 within an external pouch, or second womb; the pouch 

 supported by two marsupial bones ; thumb of the hind 

 extremities mostly distinct and opposable to the fingers, 

 in a few species wanting. 



Inhabiting South America, New Holland, and the Indian 

 Islands ? 



Sub-Division I., with Cajiine and insectivorous Cheek-teeth. 



Gen. I. — DiDELPHis. 



Incisors y ; the two intermediate in the upper jaw 



longer than the rest, and separated from them ; in the 



lower jaw they are very small and equal. Canine |4, 



strong, compressed, and a lillle projected outward. Cheek- 



J85 



