ai4 BLACK GOB Y, Class IV; 



DEiCRIP. 



bluant of rivers, which lafl: feems to have been our 

 coQimon orudseon. 



This fpecies grows to the length of fix inches: 

 the body is fofc, fiippery, and of a flender form: 

 the head is rather large ; the cheeks inflated ; the 

 teeth fmall, and difpofed in two rows : from the 

 head to the firil dorfal fin is a fmall fulcus. 



The firft dorfal fin confifts of fix rays ; the fe- 

 cond of fourteen j the pectoral fins of fixteen or 

 feventeen, clofely fet together, and the middlemoil 

 the longed ^ the others on each fide gradually 

 fhorter. 



The ventral fins coalefce and form a fort of 

 funnel, by which thefe fifh affix themfelves im- 

 iiioveably to the rocks, for which reafon they are 

 called Rock-fifi, 



The tail is rounded at the end. 



The color is brown, or deep olive, mixed with 

 dark ftreaks, and fpotted with black : the dorfal 

 and anal fins are of a pale blue, the rays marked 

 ^'ith minute black fppts. 



