178 



ZOOLOGY, 



12. Polypterus* Gill'membrane one rayed ; Jins numerous 

 along the back. ' 



13. Elops. Head smooth ; edges of the jaws and palate 

 roughj with minute teeth ; gill-rnembrune with thirty 

 rays, armed in the middle of the outer side with five 

 iooih-like processes. 



14. Argentina. Argentine. Tee//i in the jaws, and on the 

 tongue ; gill'memhrane eight rayed ; vent situated near- 

 the tail ; ventral fins composed of many rays; 



15. Atherina. Atherine. ZTpper j«r^ flattish ; gilUmem- 

 brane six rayed ; a silvery line extending along th* 

 sides. 



j6. Mugil. Mullet. Body and gill covers^ covered with 

 large scales ; teeth on the tongue and palate ; above th^ 

 angles of the mouth a hard callous ; gill-membrane . 

 with six incurvated rays. 



17. Exoccetus. Flying-Fish. Head covered with large 

 scales; gilhmembrane with ten rays; pectoral fms 

 very large and long. 



18. Polynemus, Head compressed^ covered with scales ; 

 snout obtuse, prominent; gilUmembrune five to ten 

 rayed ; pectoral Jins with distinct, entire, cirri. 



19. Clupea. Herring. Head compressed; snout inclining 



