THE FISHES OF NEW JERSEY. 



67 



Genus Squalus Linnaeus. 

 The Spiny Dog Sharks. 

 Squalus acanthias Linnasus. 



Spiny Dog Fish. Cod Shark. Cod Fish Shark. Thorn Back 



Shark. 



Head 5?^; depth about 7>4 ; snout 2j^ in head; width of 

 mouth 3; interorbital space 2j^ ; front edge of pectoral i}i ; 



Spiny Dog Shark. Squalus acanthias Linnsus. 



length of caudal peduncle i ^ ; upper caudal lobe 4 J4 in rest of 

 body. Body long and slender. A pit at root of caudal above. 

 Head depressed, elongately triangular when viewed above. Eye 

 elongate, a trifle anterior. Mouth little curved. Teeth simple. 

 Nostrils midway in snout below. Internasal space a little less 

 than space between tip of snout and nostrils. First dorsal mid- 

 way between pectoral and ventral. Second dorsal smaller, nearer 

 caudal than first dorsal. Caudal with lower lobe rounded, half 

 length of upper. Pectoral small, not reaching first dorsal, and 

 greatest width a trifle more than half its length. Ventral blunt. 



