I 93-] Allen, Mammals from Northeast Siberia. 123 



tion through the skin of one of these shows the dermis pure 

 white and the base of the epidermis black, gradually fading 

 towards the surface. Small black pigment lines run from this 

 black base to the surface, giving it the spotted appearance. 

 On the white ones the epidermis is entirely white with no 

 black at the base nor pigment lines running through it. 



"In an adult white specimen the epidermis was 9, dermis 

 4, and blubber 53 mm. thick, and in a large hair-brown 

 specimen the epidermis was 9, dermis 7.4, and blubber 43 

 mm. thick. The blubber is clean and vinaceous cinnamon 

 in color. The eyeball of an adult male was 30.5 and the iris 

 1 6. 8 mm. in diameter; iris hazel brown. In no specimen did 

 the bulge of the forehead extend beyond the lips. 



"The teeth, which are irregular and peglike in form, are 

 loosely set with wide spaces between them in the rubber- 



like gum. The normal formula is ^^, but this is seldom 

 found, owing to loss or suppression. In one large male it was 



i|^; those above all inclined forward, and the first four on 

 each side below inclined forward and the others backward. 

 The two posterior teeth were curved and horn-shaped, and lay 

 forward* flat on the gums. The first four on either side below 

 were worn down until they resembled short posts ; the second 

 four above had half of the crown worn away, leaving them 

 tusk-shaped. In younger specimens the teeth are more regular. 



"The internal ear cavity of nearly every specimen exam- 

 ined contained small, filiform worms, about 19 mm. long and 

 .25 mm. in diameter. In some the cavity, which is quite 

 large, was almost entirely filled with them. 



' ' I again visited the place on May 7 and counted 1 64 car- 

 casses on the ice, and Mr. Hobson, whose whaling camp found 

 the school, told me that his natives had thrown 70 more back 

 into the hole. About 20 were still alive in it, but these were 

 killed later, and 20 dead ones were in the water frozen in by 

 the ice. Nearly 300 of the school were thus accounted for, 

 and estimating that only one in three was secured after being 

 killed, although I think that one in five wounded would be 

 nearer the truth, it is seen that it originally contained not less 

 than 900 individuals, not one of which escaped." N. G. B. 



