IHALASaARCTOS. 



217 



Synopsis of the Genera, 



A. Sea-Bears. Soles of the feet hairy, tvith a few bald pads. The tuber- 



cular grinder longer than the flesh- tooth. Lips slightly extensile. 

 Cutting-teeth f . Bars rounded, hairy. 



1. Thaiassabctos. Kose of skull produced, longer than broad. 



Front false grinders small, far apart; upper tubercular 

 moderate. 



B. Land-Bears. Solesof the feet bald, ccdlous. Cutting-teeth^. Lips slightly 



extensile. Cover of nostrils moderate. Ears rounded, hairy. Under- 

 side of the base of the toes hairy. 



2. IjEstrs. Nose of skull produced, longer than broad, rounded 



above. Forehead convex, separated from the nose by a cross 

 line. False grinders far apart, small. Palate flat. Brain- 

 case swollen. Lower jaw moderate. 



3. Mtemaecios. Nose of the skull produced, much longer than 



broad, flat above. Nose, forehead, and front of crown aU 

 on one Hne. False grinders far apart, small. Palate concave. 

 Brain-case compressed. Lower jaw large, elongate. 



4. Heiaectos. Nose of skull very short, as broad as long, form- 



ing a line with the forehead. False grinders crowded, large. 

 Palate broad, flat. 



C. Honey-Bears. Soles of the feet bald, caUom. Cutting-teeth f. Lips 



very extensile. Nostrils large, with a large cover. Front of palate 

 bent up. Ears tufted. Underside of base of toes bald. 



5. Mbltjesits. Nose of the skull produced, longer than broad, 



rounded above. False grinders far apart; upper hinder 

 tubercular short. 



A. Sea-Bears. Soles of the feet covered with close-set hairs, with a few 

 small bald pads. JSead elongate ; forehead scarcely raised above the line 

 of the nose ; cutting-teeth f ,• lips slightly extensile ; nostrils moderate. 



I. THALASSAKCTOS. 



Head elongate; ears rounded, hairy; forehead scarcely raised 

 above the line of the nose. Neck elongate. Feet broad, large ; front 

 claws elongate, curved. Fur short, soft, dense. Skull elongate. 

 The upper tubercular grinder elongate. The palate broad, concave, 

 rather contracted behind, and then suddenly contracted behind the 

 last tooth. The hinder nasal aperture elongate, narrow, the sides 

 much longer than the front edge, which is arched ; the sides bent in 

 towards the middle, contracting the aperture. 



Sea-Bears (Thalassarctos), Gray, Ann. of Philos. 1825; P. Z. S. 1864, 



p. 680. 

 Thalassarctus, Gloger, lSi2. 



Hah. Arctic Seas. 



