80 BULLETIN OF THE 



lars are sharply conical, with no accessory cusp, or occasional)- exceedingly 

 slight ones. All the molars are simple rooted in the specimens I have heen 

 able to examine. Some of them have deep median grooves either on the 

 inside or outside of the fangs, or on both sides, which seem to indicate that 

 the fangs are made up of two connate roots. The distinctness of these 

 grooves varies in different specimens (compare Figs. 6 b with 7 c, PI. II) 

 and in the corresponding teeth of the two sides of the mouth in the same 

 specimen. Hence it is not improbable that specimens may be found in 

 which the grooves of the fangs may be entirely obsolete, or so deep as to 

 nearly or quite divide the fang into two distinct roots. The roots of the 

 molars are very short, and but partially fill their alveoli ; hence when the 

 periosteum is removed they fit so loosely that they require to be cemented 

 in with wax or other substance to prevent their constantly falling out 

 whenever the skull is handled. The canines and the incisors have much 

 longer roots, which more nearly fill their sockets. The roots of the molars' 

 are comparatively much shorter and thicker than in Eumetopias, and 

 club-shaped, whereas in the latter they are slender and tapering. They 

 are a little shorter than in Zalophus Gillespii, which has also short-rooted, 

 loosely fitting teeth.* 



Skeleton. — Vertebral formula : Cervical vertebrae, 7; dorsal, 15; lumbar, 

 5; caudal (including the 4 sacral), 13 to 14 in the males, and 14 to 15 in 

 the females. 



The skeleton in its general features resembles that of Eumetopias Stel- 

 leri, already described. The bones of C ursinus are, however, all slen- 

 derer, or smaller in proportion to their length, than in that species, the 

 general form of the body being more elongated. The scapulas are shorter 

 and broader than in E. Slelleri, the proportion of breadth to length being 

 in the one as 11 to 10 and in the other as 13 tu 10. The pelvis is more 

 contracted opposite the acetabula in C. ursinus tha i in E. Stelleri, and 

 the last segment of the sternum is also longer and narrower. The differ- 

 ences in the «kull of the two forms have already K'en pointed out in the 

 generic comparisons. In proportions, the principal difference, aside from 

 that already mentioned as existing in the form of the scapula, consists in 

 the longer neck and longer hind feet in the C. ursinus ; the ratio of the 

 length of the cervical vertebras to the whole length of the skeleton being 

 as 15 to 100 in E. Stelleri, and as 23 to 100 in C. ursinus; and the ratio of 

 the length of the foot to the tibia being in the former as 13 to 10, and in 

 the other as 10 to 10. The following measurements indicate the length 

 of the principal bones, and of the different vertebral regions. 



* Figures of the teeth of this species are given in the Fauna Japonica, Mammals, 

 PI. XXIII, Figs. 4-9. 



