PISHES OF NEW YORK 25 



8 Prionace glauca (Linnaeus) 

 Great Blue Shark 



SqiiahiS glaucus Linnaeus, Syst. Nat. ed. X, 235, 1758. 



Carcharias {Prionodon) glaucus Muller &, Henle, Plagiostwmen, 36, pi. II, 



1838. 

 Carcharias glaucus Gunthee, Cat. Fish. Brit. Mus. VIII, 364, 1870. 

 Carcharhinus glaucus Jordan & Gilbert, Bull. 16, U. S. Xat. Mus. 22. 1888. 

 Prionace glauca Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 33, pi. IV, 



fig. 16; pi. V, fig. 16a, 1896; Smith, Bull. U. S. F. C. for 1897, 88, 1898. 



Snout very long; nostrils rather nearer to the mouth than to 

 the tip of snout; a slight groove at the angle of the mouth; teeth 

 of the upper jaw oblique, slightly constricted near the base; 

 lower teeth narrow, lanceolate, with a broad base in the adult, 

 triangular in the young. Pectoral fin long, falciform, extending 

 to below the dorsal. Color light bluish gray above, paler below. 



The great blue shark is common in the Mediterranean and is 

 found occasionally on our Atlantic and Pacific coasts. 



Dr H. M. Smith records it as a very rare species at Woods 

 Hole Mass., only a single individual being certainly known from 

 that locality, taken from a trap in July 1877. 



Genus carcharhinus Blainville 



Body rather robust, the head broad and depressed; mouth 

 inferior, with the teeth in both jaws strongly serrated in the 

 adult, less so or entire in the young; those in the upper jaw 

 broad or narrow, those below narrow, straight, and nearly erect. 

 No spiracles. First dorsal large, placed not far behind pec- 

 torals; pectorals falcate; second dorsal small. Embryos at- 

 tached by placenta to the uterus. 



9 Carcharhinus obscurus (Le Sueur) 



Dusky Shark 



Squalus obscurus Le Sueur, Jour, Ac. Nat. Sci. Phila. I, 223, pi. 9, 1818. 

 Carcharias {Prionodon) obscurus Muller & Henle, Plagiostomen, 46, 1841. 

 Carcharias obscurus De Kay, N. Y. Fauna, Fishes, 350, pi. 61, fig. 201, 



1»42. (Copy of Le Sueur); Storer, Hist. Fish. Mass, 243, pi. XXXVI, 



fig. 2, 1867; GiJNTHER, Cat. Fish. Brit. Mus. VIII, 366, 1870. 

 Carcharhinus obscurus Jordan & Gilbert, Bull. 16, U.S. Nat. Mus. 22, 1883; 



Jordan & Evermann, Bull. 47, U. S. Nat. Mus. 35, 1896; Smith, Bull. 



U. S, F. C. for 1897, 88, 1898. 



Head broad, somewhat pointed, flattened above and below; 

 snout sharp edged, rounded and wide at the end; eyes large, 



