ZOOLOGY. 179 



Vpwards ; mouth rough within ; gUl-menibrane eight 

 rayed ; belly sharp, and in most species serrated. 



The Herring tribe afford a very great quantity of food to 

 xnanki;id, and is one of the most abundant and prolific genera ; 

 the Herring fishery employing a rery considerable portion of 

 the population of such districts as pursue this trade. 



20. Caprlnus. Carp. Mouth small ; teeth situated in the 

 throat ; gill-membrane throe rayed ; one dorsal fin. 



81. Mormyurus. Snout protruded ; teeth several, emargi- 

 nated ; aperture to the gills without a cover ; gill' 

 membrane one rayed ; body scaly. 



Division \\.— CARTILAGINOUS FISHES, 



ORDER I. 



BRANCIIIOSTEGO US. 



GILLS WITHOUT BONY BAYS. 



In this extensive order but few of the kinds are useable as 

 food, most of them are exceedingly voracious, devouring 

 every animal they can master ; they vary greatly in form, 

 and equally so in habits and propensities ; the larger part 

 feed on fish, and dead carcasses, others on molusci3B, and 

 sea weed ; there are eighteen genera in the order. 



N 2 



