84 CLASS IV. ORDER lit. 



nished above with a flat, ovate, transversely sul- 

 cated shield ; gill- membrane six-rayed ; body 

 without scales. 



CoitYFHJENA, head sloping suddenly down- 

 wards; gill-membrane five-rayed ; dorsal-fin the 

 length of the back. 



MACROURUS, (imminset,) head large ; eyes 

 large ; body at the hind part attenuated into the 

 tail. 



GOBIUS, (goby,) head small ; eyes approximat- 

 ed ; gill-membrane four-rayed; ventral-fins unit- 

 ed into the form of a funnel. 



GOBIOMORUS, habit as the Gobius ; with vent- 

 ral-fins distinct. 



COTTUS, (bullhead,) head broader than the bo- 

 dy, spiney ; eyes vertecal and having a nictitating 

 membrane ; gill-membrane six-rayed. In most 

 species the body is without scales ; attenuated to- 

 wards the tail, and with two dorsal-fins. 



SCOHPJENA, head large, aculeated, cirrose, ob- 

 tuse, without scales, sub-compressed ; eyes neav 

 each other ; teeth in the jaws, palate and throat ; 

 gill-membrane seven-rayed; body fleshy; dor- 

 sal-fin single, with the rays of the forepart spiny. 



ZEUS, (dory,) head compressed, sloping down; 

 upper lip arched by a transverse membrane ; tongue 

 subulate (in most species) ; body compressed, 

 broad, sub-rhomboid, thin, and of a bright colour : 

 gill membrane with seven perpendicular rays, the 

 lowest transverse ; dorsal fin (in most species) 

 having projecting filiform rays. 



PLEUROKECTES, (flounder, holibut, sole,) eyes 

 both on the same side of the head ; body compress- 

 ed, one side representing the back and the other 

 the abdomen. 



