322 BULLETIN OF THE BUREAU OF FISHERIES 



Shovel-head shark, Cestracion tiburo (Linnaeus) 



One specimen of this southern species was recorded by Garman (1913, p. 160) 

 from Massachusetts Bay. 



This record was omitted from "Fishes of the Gulf of Maine" (Bigelow and 

 Welsh, 1925). 



Hammerhead shark, Cestracion zygaena (Linnaeus) 



Captures of a 12-foot fish, in August 1928, by the swordfishing schooner Doris M. 

 Hawes, between Browns and Georges Banks, and of a small one in Halifax Harbor, 

 September 1932 (Vladykov, 1935, p. 8), extend the known range to the northward 

 and eastward. 



Thresher, Alopias vulpinus (Bonnaterre) 



The International Commission on Zoological Nomenclature rejects Valmont's 

 name, Vulpecula marina, consequently the next oldest name, Alopias vulpinus, must 

 be substituted (Smithsonian Institution, 1925, p. 27). 



Mackerel shark, Isurus nasus (Bonnaterre) 



The fact that Isurus punctatus (Storer) is identical with I. nasus (Bonnaterre) 

 has been pointed out by Bigelow and Schroeder (1927). 



The range of the mackerel shark in the western side of the Atlantic is now known 

 to extend as far north as the Grand Bank of Newfoundland (Rept., Nfld. Fish. Res. 

 Lab., 1935, p. 79). 



Sharp-nosed mackerel shark, Isurus tigris (Atwood) 



The many recent fishery investigations in the Gulf of Maine have indicated that 

 this species is much less common there than /. nasus, for whereas many of the latter 

 have been observed and captured since 1923, only one record of the sharp-nosed 

 mackerel shark has come to our attention within that time, a fish 8% feet long taken 

 10 miles northeast of Nantucket Lightship, June 22, 1930, by the schooner Linta 

 (Firth, 1931, p. 8). 



White shark, Carcharodon carcharias (Linnaeus) 



To the few existing Gulf of Maine records of this ferocious shark are added that 

 of a 13-foot fish taken off Portland in a gill net during October 1931 (identified by 

 Dr. W. C. Kendall) ; one (identified from a tooth) which attacked a fishing boat off 

 Digby Gut, Bay of Fundy, July 2, 1932 ;' a somewhat doubtful record from off 

 Halifax, June 27, 1930 ; 3 and another, 15 feet long, apparently of this species, caught 

 off Monomoy Point, Cape Cod, in the fall of 1928. 



Spiny dogfish, Squalus acanthias Linnaeus 



The spiny dogfish is now known along the American coast as far northward as 

 the Straits of Belle Isle. It has also been taken off the west coast of Greenland at 

 Sukkertoppen and in the vicinity of Holsteinborg (Jensen, 1914, p. 7). 



1 Harry Piers, Proc, Nova Scotian Institute ol Science, vol. XVIII, pt. 3, p. 198, 1934. 

 • Ibid., p. 196. 



