660 GEOLOGICAL SURVEY OF NEW JERSEY. 



Family CARCHARIIDiE. 



Two dorsal and an anal fin, without spines ; eyes with nictitating^ 

 membranes. 



MUSTELUS, Cuv. 



M. caniB, Mitch. (hinntUus, Blainv., vulgaris.) Dogfish. Dog Shark. 

 Smooth Hound. 

 Mouth with labial folds; teeth flat, without cutting edges; 

 no pit at root of tail ; no placenta in development. Smallest of 

 our sharks. 



" Quite common, and met with as the thresher." 



GALBOOBRDO, M. & H. 



Q. tigrinuB, M. & H. Tiger Shark. 



Teeth with sharp edges, serrated ; a pit at root of tail ; a 

 double notch on caudal fin ; color brown, with dark spots ; cau- 

 dal fin about one-third of whole length ; rather large. Range* 

 from Cape Cod to the Indian Ocean. 



CAROHARIAS, Raf. 



(Cynoeephalus. Squalus. Prionodon. Eulamia.) 



O. obscurus, Le 8. (Plaiypodon, Gill.) Dusky Shark. 



No spiracles; teeth serrated, upper ones oblique, notched on 

 outer margin, in lower jaw clavate ; first dorsal fin large, close 

 behind the pectoral ; color dark, clear blue above, white below ; 

 large, reaching ten feet. " Frequently taken on our coast." — 

 Jordan. 



" Not a common species." — [C. C. A.] 



O. cceruleuB, De K. [milbertl, oaudaia, De K.) Small Blue Shark. 



Length of snout equal to width of mouth ; color slate blue, 

 white below ; fins with black tips ; pectorals rather small ; upper 

 teeth serrate, not notched ; size much as preceding. 



" Prof. Baird reports this species quite numerous at Beesley's 

 Point. It is about equally abundant along our coast. Speci- 

 mens occasionally wander up Delaware Bay, but do not leave 

 the salt water." 



