Somniosuse 45 
Lemargus borealis Ginther, Cat. Fish., VIII, 1870, p. 426. 
Somniosus microcephalus Jordan and Evermann, Fish. N. and M. America, I, 
1896, p. 57.—Jordan and Fowler, Proc. U.S. Nat. Mus., XXVI, 1903, p. 638. 
Habitat. 
Head measured to first gill-cpening 4, height of body 5 in total length as measured 

Arctic seas south to Cape Cod, Oregon, France and Japan. 
to root of upper caudal lobe. Eye 14, interorbital 3, greatest diameter of spiracle 28, 
its least diameter 56, distance between spiracles 24, between spiracle and eye 65, snout 
as measured from anterior rim of eye 23, width of mouth-cleft between its angles 13, 
length of labial fold 5 in head. 
Body thick and clumsy, rapidly tapering behind; head longer than height of 
body. Mouth moderate, transverse, little arched, with a deep groove running 
backward and forward from its angles ; nostrils near the extremity of the snout. Jaws 
feeble; upper jaw with five or six rows of small sharp teeth, which are slightly 
incurved, lancet-shaped ; number of teeth in one row about twenty six on each 
side of the jaw; lower jaw with two rows of broad, quadrangular, outwardly 
directed teeth, whose inner margin forms a cutting edge, which is entire ; about thirty 
teeth in one row oneach side. Spiracles moderate ; no nictitating membrance.  Gill- 


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