340 Mr. Gray on Mammaliiii [Nov . 



Fam.A. Didelphid^e. f.^^ .o .i^ur» 



Cutting teeth distinct; canine sometimes wantitTg'f^^teairs 

 acutely tubercular ; thumb of hind feet mostly distinct, clawless ; 

 nursing pouch and marsupial bones distinct. 



.tl9^.^ting teeth six above, two below. 1. Macropma. Maci^o- 

 pus, '^^crif;. Halmaturus, Ilfigcr. Potorous, Desm, 2. PJialan- 

 ^siiria, Acrobata, Desm, Petaurus, F, Cuv. Phalangista and 

 l3alaji,tia, Illiger.'l Phascolaretus, Blahiv. ftCutting teeth 

 not six above, and two below. 3. P/iascolomina. Phascolomys, 

 Illiger, 4. Didelphina. Didelphis, Lin. Cheironectes, IlUger. 

 5. Dasyurifia. Peracyon, Grai/s Dasyurus, Illiger. Phasco- 

 gale, lent. 6. Peramdina, Perameles and Isodon, Geoff. > 



Fam.b. Phocid^. ^ -^^^"^ 



Cutting teeth six or four above, four or two below ; cbh?ne 

 teeth distinct ; grinders tubercular, or truncated ; limbs short, 

 fiff-shaped, hinder ones horizontal ; nostrils operculated. 



fGrinders many rooted ; ears none ; nose simple. 1 . Steno- 

 rhyncina. Pelagios, jp. Cnv. Stenorhyncus, F. Cuv. 2. Phociiia. 

 Phoca. tt(Orinders roots simple, or divided, and with ears 

 distinct.) 3. Fnhydrina. Enhydra, Flem. 4. Otariina. Otaria, 

 Peron. Platyrhynchus, F.Cuv. 5. Stemmotopina. Stemmoto- 

 pus and Macrorhinus, F. Cuv. 



% 2. Teeth not of three sorts, or not forming a continuous series. 



Order III. — Cet^, Lin. 

 Teeth none, or all similar, conical ; body, fish-shaped, nearly 

 bald ; limbs fin-shaped, hinder sometimes forming a horizontal 



tail. ; ' .^j - . .^i<'ii« Ji4t 



^Skin smooth, without any hair or ioJ\iskers. ■ , , 



Fain. 1. BALiENIDiE. 



Head very large, one-third the length of the body. 1 . BalcE" 

 nina. Balsena, Willoughby. Balsenoptera, Lacep. 2. Physe- 

 Uwiuh,jiiBhy^Qlu9yLacep. Physeter, Lin. C?iiodf^i^^lm' 



Fam.^. DELPHlNlDiE. ! 



Head small or moderate; body long; blbW'ers^iinlt'ecl.'' 1. Del- 

 phinina. Delphinus, Lin. Delphinorhyricus, Blainv. '2. Phoca- 

 niua,^ Phocaena, Cuv. Delphinapterus^^Xacej;.^ He^er^don, 



,zy^* Skin rather hairy, whiskers distiMt^',^igfmdm^jlat>^lopped. 

 .■^2il'«;/«. 3. TRiqHECHiD.*:. >^ \m,.'.m < ; "• 



Body oblong; hind feet, rather prominent, cla^w^y tail short, 

 separate; canine upper, very long exserted. 



Trichecus, Lin. •a.aioaii.il .M^^>;V 



>«».^4:'MAN'jy¥i^^.: ■ "''^ ' ^ 'jfUowiflid3^Sai«D0 



\iQi \ saoJ Yiav Jaei Uau jViioria issl aiui \'>- 



