1868.] DR. J. E. GRAY ON THE CANID^. 521 



The skull 815 a in the British Museum, out of this skin, is very 

 like that of Urocyon vtrginianus in the form of the crown-plate, 

 but it differs from that skull in the bullae of the ear-bones being 

 longer, more ventricose and rounded, and in the last upper tuber- 

 cular grinder being small and more triangular, narrower on the inner 

 edge. 



13. Leucocyon. 



Tail very full and bushy ; soles of feet densely furred. Fur, of the 

 adult, white; of the young, greyish lead-colour. 

 Skull short ; nose broad before the orbits. 



Leucocyon lagopus. B.M. 



Canis lagopus, Linn. Fauna Suec. 4 ; S. N. i. 59 ; Pallas, Zoogr. 

 Rosso- Asiat. i. 51, t. 5; Tilesius, Nov. Acta Acad. Nat. Cur. xi. 

 3/5, t. 47; Blainv. Oste'ogr. t. 5 (skull). 



C. (Vuljjes) lagopus. Rich. F. Bor.-Araer. i. 83, 1829. 



Vulpes lagopus, Aud. & Bachm. N. A. Quadr. ii. 89, 1. 121,1829 ; 

 Gray, List Mamm. B. M. 60 ; Gerrard, Cat. of Bones of Mamm. 

 88. 



Renard blanc, Buffon, H. N. Suppl. vii. t. 51. 



Arctic Eox, Pennant, Shaw. (Skulls 780 a, c, d.) 



Junior? Sooty black. Skull shorter and broader. 

 Canis fuliginosus, Shaw, Zool. i. 351. (Skulls 1316 a, b, c.) 

 Sooty Fox, Pennant. 

 Isatis gris, F. Cuv. Mamm. Lithog. 

 Vulpes fuliginosus, Gerrard, Cat. of Bones of Mamm. 88. 

 V. lagopus (Arctic Fox), Aud. & Bachm. N. A. Quadr. iii. t. 122 ; 

 Baird, Mamm. N. A. 137. 



Canis isatis, Gmelin, Nov. Comm. Petrop. v. 358. 

 Hah. Arctic region : Newfoundland (/fMo^M^ort) . 



Var. smaller? Pessez or Golubri. 



Canis isatis, Gmelin, Nov. Com. Petrop. v. 358 ; Thienem. 



C, lagopus, Pallas, Zoogr. R.-Asiat. i, 51, t. 5 ; Tiles. N. Act. 

 Nat. Cur. xi. 375, t. 47. 



C. isatis, Gmelin, Nov. Comm. v. 358 ; Buffon, H. N, xiii. 372 

 (partly). 



Hab. North Asia. 



E. Bristle-tailed Foxes. Tail elongate, covered with soft elon- 

 gated hair and with a central concealed crest of stiff hairs un- 

 mixed with soft fur. Skull — temporal muscles separated by a 

 wide flat crown, narrow at the occiput. 



14. Urocyon. 



Muzzle short. Temporal crests of the skull always widely sepa- 

 rated. Postorbital process thin, spread out, concave above. A 

 supplementary tubercle on the lower sectorial. The under jaw with 

 an angular emargination below. Pupil ? Bullae of car-bones 



