386 FISHES. 



species extending into the neighbouring sub-tropical parts. 

 They do not attain a large size, and generally have a plain 

 coloration. Conodon is an allied genus. 



HiEMULON. — Body oblong, compressed, with ctenoid scales of 

 moderate size. Cleft of the mouth horizontal, generally wide. 



Fig. 156. — Hsemiilon brevirostrum. 



with the jaws equal in length anteriorly ; a central pit below the 

 chin ; villiform teeth in the jaws, without canines ; palate tooth- 

 less. One dorsal, with twelve or thirteen spines ; anal with 

 three ; the soft portions of the vertical fins scaly to their margins. 

 Prreoperculum serrated. Branchiostegals, seven. 



Marine J sixteen species are known from the ^coasts of 

 Tropical America ; they are of rather small size. The species 

 iigured occurs on both sides of Central America. Hapalogenys 

 is an allied genus. 



D1AGRA.MMA. — Body oblong, compressed, covered with rather 

 small ctenoid scales. Upper profile of the head parabolic ; cleft 

 of the mouth small, horizontal ; from four to six pores under the 



