456 



Memoir Sears Foundation for Marine Research 



cauo-ht, from the Gulf of Maine and the vicinity of Woods Hole, Virginia and North Caro- 

 lina. 



Distinctive Characters. S. acanthias is easily separated from other members of its 

 genus in the North Atlantic by the facts that its first dorsal spine is over or posterior to the 

 inner corner of the pectoral (about over the midpoint of the inner margin of the pectoral 



Figure 87. A, Squalus acanthias, female, about 815 mm. long, from Woods Hole, Massachusetts (Harv. Mus. 

 Comp. Zool., No. 35862). B Head of same from below. C Right-hand nostril of same, about z x. D Second 

 dorsal fin of adult male from the same locality to show the length of the spine. E, Squalus jernandinus, female, 

 about 914 mm. long, from Island of Juan Fernandez (Harv. Mus. Comp. Zool., No. 841). F Right-hand 

 nostril of same, about 2 x. G Dermal denticles of same, about 20 x. H Apical view of denticle. / Second dorsal 

 fin of Squalus ilainville, female, 570 mm. long, from Italy (? ) (U. S. Nat. Mus., No. 28473) to show length 

 of spine. 



in blainville and cubensis), that the midpoint of the bases of its pelvics is much nearer 

 to the second dorsal than to the first (about midway between the two in blainville and 

 cubensis) ^hy the simple anterior margin of the nostril (bilobed in blainville and cubensis) j 

 by the rounded inner corner of the pectoral (angular in cubensis), and by its shorter dorsal 

 spines and white-spotted coloration. It is further separated from blainville by the deeply 

 concave distal margin of its pectoral. 



Description. Proportional dimensions in per cent of total length. Male, 705 mm., 

 from Buzzards Bay, Mass. (Harv. Mus. Comp. Zool., No. 35864). Female, 814 mm., 

 same locality (Harv. Mus. Comp. Zool., No. 35863). 



