new Genus of Urside. 129 
fore, to sever thibetanus from Tremarctos, and to name and 
define it as follows :— 
Genus Arcticonus *, nov. 
Type, Ursus thibetanus, Cuv. 
Fore foot with digital pads separated almost to their 
proximal extremities and capable of wide divarication ; 
digital pad of the pollex set far back, behind that of the 
second digit. Area between the digital pads and plantar 
pad overgrown with hair, except behind the pads of the 
pollex and fifth digit. Carpal pad as wide as the plantar 
pad and elongately piriform, being broad externally and 
narrowed towards the inner, or pollical, side of the foot, 
where it touches the plantar pad. Elsewhere the carpal pad 
is separated from the plantar pad by a depressed hairless 
area of grooved and thickened skin. The wrist above the 
carpal pad is thickly hairy. 
Hind foot resembling the fore foot in the separation 
of the digital pads, and the hairiness of the area between 
them and the plantar pad ; digital pad of the first and fifth 
digits set behind those of the second and fourth, so that the 
series is strongly curved, Plantar pad forming a continuous 
shield with only a feebly-marked depression, devoid of hairs, 
on the inner or hallucal margin. 
Ears large. Rhinarium normal ; ; upper lip hairy, except 
for a narrow naked strip of skin extending from the rhina- 
rium in the middle line. 
The only species of bears which combine in their fore feet 
free digital pads with an immense carpal pad as wide as the 
plantar pad, aud merely defined from it by a groove of naked 
skin, are Helarctosmalayanus and Tremarctos ornatus and their 
allies. Apart from the characters supplied by the subrhinarial 
tract of the upper lip aud the ears, Helarctos may be distin- 
guished by the shortness of the skull in front of the post-orbital 
processes, involving reduction in length of the post-canine 
space, suppression of one of the anterior upper premolars, 
and other features requiring analysis with considerable 
material. Tremarctos also has a very short skull, much 
shorter than in Arcticonus thibetanus. In one point at 
least it differs from the skull of all other bears. In the 
mandible the hollow of the coronoid process is defined 
below by a strong ridge passing downwards and backwards 
* dpxros, a bear, éuedy, -ovos, an image. Hence the second syllable of 
the generic name is long, and the third short. 
Ann. & Mag. N. Hist. Ser. 8. Vol. xx. 9 
