THE FISHES OF NEW JERSEY. 65 
Cestracion tiburo (Linnzus). 
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. 
Zygena tiburo Baird, 9th An. Rep. Smiths. Inst., 1854, p. 337 
[353]. 
Cestracion tiburo Abbott, Geol. N. J., 1868, p. 829, from Baird. 
Reniceps ttburo Bean, Bull. U. S. F. Com, VII, 1887, p. 152, 
from Baird. 
Cestracion zygzena (Linnzus). 
Hammer Head Shark. Hammer Head. Hammer Heap Shark. 
Shovel Nose Shark. 
Head 5%; depth about 9; width of head 3345; width of 
mouth 25% in head; front edge of first dorsal 1%; pectoral 134 ; 
length of caudal peduncle 2?/,; upper caudal lobe 2% 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. Mouth 
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 MU 
