THE FISHES OF XEW JERSEY. 65 



Cestracion tiburo (Linngeus). 

 Bonnet Headed Shark. 



A small shark about 5 feet in length of uniform ashy color 

 with some resemblance to the hammer head, but easily to be 

 distinguished by the kidney-shaped head. 



I have not seen any New Jersey examples. Possibly the re- 

 ports of the ''shovel nose shark'' from Cape May may in part 

 refer to this species. It is also possible that the fisherman may 

 apply the same name to species of Carcharhinus. Ashmead ob- 

 tained it at Beesley's Point, where it was also reported to Baird. 



ZygcBua tiburo Baird, 9th An. Rep. Smiths. Inst., 1854, p. 337 



[353]- 



Cestracion tiburo Abbott, Geol. X. J., 1868, p. 829, from Baird. 

 Reniceps tiburo Bean, Bull. U. S. F. Com., VII, 1887, p. 152, 

 from Baird. 



Cestracion zygaena (LinriEeiis). 



Hammer Head Shark. Hammer Head. Hammer Heap Shark. 

 Shovel X'ose Shark. 



Head 5^^ ; depth about 9; width of head 3^; width of 

 mouth 2 5/^ in head; front edge of first dorsal lYs ; pectoral lYs ; 

 length of caudal peduncle 2^/7 ; upper caudal lobe 2}i in rest of 

 body. Body rather slender, not much compressed. Head truly 

 hammer-shaped, and length of hammer along posterior margin 

 nearly equal to its width near eye. Eye a little elongate. ]\Iouth 

 with rather deep gape. Teeth entire, similar in both jaws and 

 with notch at base on outer edge. First dorsal large, falcate, and 

 close behind pectorals. Second dorsal smaller than anal, which 

 begins a little in advance. Caudal long, and lower lobe 2^ in 

 length of upper. Pectoral rather short, greatest width 1% in 

 its length, and not quite reaching end of base- of dorsal. Ventral 

 broad, and inserted a little before middle of interdorsal space. 

 Color when fresh slaty, a little paler below. Edges of caudal. 



5 ^^^ 



