20 SEALS. 



with a single conical root; and on the right side both these 

 teeth are united together in one cavity ; arid as there are four 

 other grinders in each side, it would appear as if there were 

 front grinders of two sets. The third, fourth, fifth and sixth of 

 the same jaw have a compressed, single, tapering root, with a 

 deep central groove nearly dividing it into two parts, the groove 

 being deepest and most distinguishable on their outer side. In 

 the lower jaw the front grinder has a double crown, with a 

 thick single root, tapering below, as if formed of two teeth united 

 together by their roots. The second and third grinders have a 

 broad, compressed, single root, divided by a rather deep, central, 

 longitudinal groove on each side, and the fourth and fifth 

 grinders each have two tapering, nearly parallel roots, well-sepa- 

 rated at the base from each other. In this skull the palate is 

 rounded behind, and the suture between the two bones is much 

 more nearly in its centre. I do not recollect to have observed 

 such a malformation, or soldering together of the roots of the 

 teeth in any other beast. 



b 9 c. Skull and skeleton. 



The skull has the first upper and lower grinder with a single 

 large subcylindrical root, tapering to a point beneath, and each 

 of the other grinders has two conical separate roots diverging 

 nearly from the collar. The palate is broad and rather truncated 

 behind, and the transverse suture between the two bones in the 

 palate is rather more than two-thirds the distance from the inner 

 edge of the cutting teeth. 



d. Skull. Figured Zool. Erebus fy Terror, t. 8. f. 3, 5. Ant- 

 arctic Ocean. Presented by the Lords of the Admiralty. 



These skulls differ considerably from one another in the form 

 of the palate and in the teeth ; but it is probable that the teeth 

 of the skull (b) belonging to the skin (Zool. Ereb. $ Terror, t. 8. 

 f. 1,2, 4) is a malformation. 



Subfamily 2. Phocina. Cutting teeth f ; the first front grinder 

 in each jaw single-rooted, rest two-rooted ; muffle bald and 

 callous between and above the nostrils, and divided by a 

 central groove j wrist rather exserted ; fingers subequal 

 claws 5 '5, large. 



Phocina, Gray, Ann. Phil. 1825, 340 ; Zool. Erebus fy Terror, 3. 

 Phocaceerna, 1, Nilsson, Vet. Akad. Hand. 1837 ; Wiegm. Arch. 



vii. ; Scand. Fauna, t. , 1840. 

 Phoca, Nilsson, Vet. Akad. Hand. 1837 ; Wiegm. Arch. vii. ; 



Scand. Fauna, xx. 1840. 

 Callocephalus, F. Cuv. Mem. Mus. xi. 1827. 



