580 New or Utile known Mammalia, 



subterminal silver-white band. Whiskers white, rigid. Ears short, 

 rounded. Upper lip and chin white. 



Inhabits Sumatra. British Museum. 

 Lu'tra indica. The muffle bald. Soles of hind feet bald in front; hinder 

 half hairy. Fur pale brown, grizzled with white. Hairs short ; longer 

 scattered ones broad. Lips, and lower part of body, pale brownish 

 white. Under fur short. Var. tip of tail white. 



Inhabits Bombay. — W. Elliott, Esq. British Museum. 

 Lidra califormca. Muffle bald. Soles of hind feet bald in front, hairy 

 behind. Fur dark brown, with scattered whitish-tipped hairs; sides, 

 lips, and beneath, pale brown ; the webs with scattered hairs. 



Inhabits California. — Capt. P. P. King. British Museum. 

 Lutra chinensis. Muffle bald. Soles of hind feet bald in front, hairy 

 behind. Fur pale brown. End of ears, lips, cheeks, chin, throat, 

 under part of the body, hinder sides of the legs, and under side of 

 the base of the tail, pale yellow. 



Inhabits China. — ./. Reeves, Esq. British Museum. 



Quite distinct from the Lutra Baring of F. Cuvier, from Sumatra^ 

 which is also a true otter, and has a muffle. 



The species of this genus are difficult to determine ; but the characters 

 to be derived from their toes, and from the nakedness of their soles, 

 have been overlooked. 



A. Toes equal, separate, webbed. Claws acute. 



a. Muffle bald. 



* Soles of hind feel bald lo the heel. L. vulgaris, L. roensis. 



** Soles bald in front, hairy behind. L. indica, L. californica, L. chi- 



lensis, L. E'nhydris, L. chinensis, L. Barang. 

 *** Soles covered with hair. Lutra Latrix. 



b. Muffle none. — L. brasiliensis. 



B. Toes half webbed. Middle and Ping Finger longest, united together lo 

 the first joint. Claws obsolete. — A v onyx Lesson. 



A. Horsfieldii Gray, Lutra Leptonyx Horsf, — A. Lalandii Lesson. 



Pteronu^ra Gray. Head large, depressed. Muzzle hairy. Feet large; toes 

 5 : 5, distinct, very largely webbed. Tail elongate, subcylindrical, with 

 a fin-like dilatation on each side of the hinder half 



Cutting teeth |; the four upper middle ones larger, equal, lancet- 

 shaped ; the outer ones small, conical ; canines elongate ; grinders like 

 Lutra ? Nostrils with only a slight nake:l space on their upper edge. 

 Eyes small. Ears small, round, very hairy on the inner side. Feet 

 very large, intermediate in size between those of the otter and the fin- 

 shaped feet of the E'nhydra. Toes elongate, with long acute claws; the 

 hinder toes very long ; two outer ones longest, and the others gradually 

 shorter to the inner ones. 



This genus is intermediate between Lutra and E'nhydra. 

 Pteronura Sambdchii, new species. Fur soft, liver-coloured brown ; 

 orbits paler. Lips, chin, and throat yellow ; the latter brown-spotted. 

 Length of head, 64 in.; body, 10 in. ; tail, 12 in. Width of head, 

 from ear to ear, 44 in.; the fore feet, 34 in. in diameter ; the hind feet, 

 4> in. long, and 3 in. wide. 



Inhabits Detnerara. — Mr. Lawrence Edmonston. Museum of the 

 Royal Institution, Liverpool. 

 Pro v cvon nivea. Fur soft, silky, white. Tail one-coloured. 



Inhabits North America, Texas. 



