660 GEOLOGICAL SURVEY OF NEW JERSEY. 



Family CARCHARIIDJE. 



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

 membranes. 



MUSTELUS, Ouv. 



M. canis, Mitch, (hinnulus, 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." 



GALEOCERDO, M. & H. 

 Q. tigrinus, 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. Ranges 

 from Cape Cod to the Indian Ocean. 



CAROHARIAS, Raf. 



(Cynocephalus. Squalus. Prionodon. Eulamia.) 



C. obscums, Le S. (Platypodon, 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. cceruleus, De K. (milberti, caudata, 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." 



