PHOCIDE 601 
fifth not greatly exceeding the others in length, and with the 
interdigital membrane not extending beyond the toes. 
Halicheerus.\—Dentition : i 3,¢4, p 4,m 4; total 34. Crowns 
of molars large, simple, conical, recurved, slightly compressed, 
OO 
Vy 
Fic. 275.—Upper permanent and deciduous dentition of the Greenland Seal (Phoce, granlandica). 
The first and second deciduous incisors are already absorbed. 
with sharp anterior and posterior edges, but without accessory 
cusps, except sometimes in the two hinder ones of the lower jaw. 
With the exception of the last one or two in the upper jaw and 
the last in the lower jaw they are all uniradicular. Vertebre: C 
7,D15,L5,8 4, C 14. 
One species, H. grypus, the Gray Seal of the coasts of 
Scandinavia and the British Isles (see page 604.) 
Phoca.2—Dental formula as the last. Teeth smaller and more 
pointed. Molars (Figs. 275 and 276) with two roots (except the first 
in each jaw); and 
their crowns with 
accessory cusps. 
Vertebre: C 7, D 
15, L 5, 8 4, C 
12-15. Head 
round and_ short. 
Fore feet short, 
with five very 
strong, subcom- 
pressed, slightly 
curved, rather 
sharp claws, sub- Fig. 276.—Skull of Common Seal, showing form of teeth. 
equal in length. 
On the hind feet the claws much narrower and less curved. The 
species of this genus are widely distributed throughout the northern 
hemisphere, and include P. barbata, the Bearded Seal; P. gran- 
landica, the Greenland Seal; P. vitulina, the Common Seal (Fig. 
277); and P. hispida, the Ringed Seal of the North Atlantic ; 
P. caspica, from the Caspian and Aral Seas; and P. sibirica, from 
Lake Baikal. 
1 Nilsson, Faun. Scandinav. vol. i. p. 377 (1820). 
* Linn. Syst. Nat. 12th ed. vol. i. p. 55 (1766). 
