18f 



ZOOLOGY. 



Isinglass ; but some have it of a very superior quality to others ; 

 they are most abundant in northern countries ; frequenting 

 the mouths of rivers, particularly at their influx with the sea, 

 they feed on small fish, molusca^, and insects ; they are taken 

 by the hook or in nets. . 



9. .Lophius. Angler. Head and bodi/ large, flat, circular ; 



tongue broad ; teeth numerous, small, situated in the 

 jaws, tongue, and palate ; one breathing aperture be- 

 hind each ventral Jin ; pectoral Jins broad and thick. 



10. Cyclopterous. Sucker. Head obtuse; teeth small, 

 sharp, numerous ; gill membrane with four cartilagi- 

 nous rays ; body thick ; back arched ; ventral fins 

 united. 



11. Balistes, File-Fish. Head compressed, in some spe- 

 cies with a spine between the eyes ; mouth narrow ; 

 teeth eight in each jaw ; of which the two anterior ones 

 are the longest ; breathing aperture narrow, placed 

 above the pectoral Jins\ gill membrane with two carti- 

 laginous rays ; body compressed, roughened with mi- 

 nute prickles. 



lis. Ostracion, Trunk-Fish. Teeth round, blunt, pointing 

 forwards ; aperture linear ; body encased in a com- 

 plete bony covering ; ventral fms wanting. 



13. Diodon. Jaws bony, entire; aperture of the gill* 

 linear ; body covered on all sides with long, sharp, 

 itrong, moveable, hollow spines. 



