116 DR. J. E. GRAY ON THE MUSTELID. [Jan. 24, 
bald, exposed; space between them bald. Tail moderate, shorter 
than the body, hairy. Skull elongate, depressed. Teeth 34; false . 
grinders 2/3; the upper tuberculated grinder rather large, inner 
lobe with one tubercle, outer edge with three. 
Fetorius, Keys. & Blas. 21. 
Mustela, § Lutreola, Schinz, Syn. Mamm. 1. 346. 
Mustela, § Putorius, Nilsson, Skand. Faun, 152. 
Putorius (sp.), Baird. 
Body nearly as stout as that of an Otter. Very destructive in 
farm-yards. 
The pads of all the toes are naked, not overgrown with hair; 
the soles with four pads placed at the base of the digits, the largest 
at the line of junction between the third and fourth digits, and well 
furred between the pads (Baird, 178). Feet in summer more naked 
than in winter. 
a. The upper tubercular grinder large, the inner half much larger 
and longer than the outer one; upper lip brown. American 
Vison. 
1. VisoN LUTREOCEPHALA. American Vison. B.M. 
Brown ; lower lip and chin more or less white. 
Var. 1. Darker; throat and chest not spotted. Vaucouver’s 
Island (Dr. Lord). 
Var. 2. Chin entirely brown. B.M. 
Mustela lutreola, Foster, Phil. Trans. Ixii. 371 ; Sabine, Franklin 
Narr. 652, 1823. 
M. vison, Briss. Quad. 246, 1756; Blainv. Ostéogr. Mustela, t. 13 
(teeth). 
M, (Putorius) vison, Richardson, Fauna B.-A. 48; Pr. Max. 
Arch. Naturg. 1861, p. 228. 
M. (Martes) vison, Desm. Mamm. i. 183, 1820. 
M. lutreocephala, Harlan, Fauna Amer. 63. 
M. vison, var. americana, Schinz, Syn. Mamm. 347. 
M., canadensis, Erxl. Syst. i. 447. 
M. canadensis, 3. vison, Bodd. Elench. Anim. 186. 
M. winingus, Barton, Am. Phil. Trans. vi. 70, 1809. 
M. minx, Ord, Guthrie’s Geog. 281, 298. 
M. (Lutreola) vison, Wagn. Schreb. Suppl. ii. 241. 
Lutra vison, Shaw, G. Zool. i. 448. 
Putorius vison, Gapper, Zool. Journ. v. 202; Aud. & Bachm. 
N. A. Quadr. i. 250, t.33; Baird, Mamm.N. A. t. 37. f. 23 (skull). 
Vison, Buffon, H. N. xiii. 308, t. 43. 
Jackash, Hearne. Fontereau, La Hontan. Otay, Sagard. Mink, 
or Minx, Fur-traders, N. A. 
Var. 3. Small; darker. 
Putorius nigrescens, Baird, Mamm. N. A. 180; Aud. & Bachm. 
N. A. Quadr. 2nd edit. iti. 104, t. 124. 
Hab. North America. 
