1865. ] DR. J. E. GRAY ON THE MUSTELID&. 129 
Consult (1) Lutra montana, Tschudi, Fauna Peruana, 120. 
LL. supra obscura, Susco-rufa, fusco irrorata, subtus nigricans. 
Hab. Peru. Fresh water, 9000 feet above the sea. Length of 
body 5-6 inches ; tail 10 inches. 
(2) Lutra paraguensis, Renger, Saéugeth. v. Paraguay, 128; Wag- 
ner, Schreb. Saugeth. ii. 216; Burm. La Plata, ii. 410. 
Nutria, Azara, Quad. i. 304. 
Hab. Paraguay. 
(3) Lutra? aterrima, Schrenck, Amurland, 43. 
Viverra aterrima, Pallas, Zoogr. Ross.-Asiat. i. 81. 
Mustela aterrima, Pallas, Middendorf, Sibirische Reise, i. 70, 
Hab. Sea of Ochotsk. 
c. Feet oblong, rather elongate ; toes rather slender, Sree at the 
end, bluntly or imperfectly clawed ; pads of palms large, of 
toes slender, separate. 
13. Aonyx. 
Muzzle bald, oblong, transverse ; upper and lower edge nearly 
straight. Toes half webbed, index and middle united together to 
the third joint ; claws obsolete or rudimentary and blunt; the inner 
toe very short, index longer, middle and fourth longest and eoual, 
the fifth shorter than the index. Skull rather short, ventricose, and 
convex behind ; nose short; forehead convex, arched ; orbit defined 
by distinct conical tubercles above and below. Flesh-tooth with a 
very large internal lobe, nearly as long as the outer portion of the 
tooth, with two cross ridges on the crown; the upper tubercular 
grinder large, massive, rather wider than long. 
The flesh-tooth of the donyz is larger and wider than in the 
Otters with well-developed claws. The outer margin of the tooth 
is produced outwards beyond the edge of the jaw, and furnished with a 
distinct margin. 
Aonyzx, Lesson, Man. 157; Fischer, Syn. 228 ; Gray, Loudon’s 
Mag. N. H. 1857, p. 550; Cat. Mamm. B. M. 71. 
Leptonyx, Lesson. 
Anahyster, A. Murray, Proc. Roy. Phys. Soc. Edinb. i, 157 
(from skull only). 
* African. Claws very rudimentary. Anahyster, 
1. AONYX LALANDII. 
Brown, beneath paler ; sides of the face, to the orbits and ears, 
throat, chin, and chest yellowish, divided from the darker colour by 
a defined line; shoulders and fore legs darker. 
Very young animals are greyish white ; the cheeks, chin, throat, 
and chest white; the shoulders browner. 
Proc. Zoou. Soc.—1865, No. IX. 
