102 MANUAL OF NATURAL HISTORY. 



36. Family. — Hog -Fishes (Synanchiidas). Body 



naked, without scales, thick, gross, often de- 

 formed with fungus, or spongy skin, with 

 fleshy lobes, or cirrhi on sides ; head spinous, 

 directed upwards \ eyes small, close to or 

 upon crown ; mouth large, vertical ; pectorals 

 large, often very long. 



37. Family. — Weevers (Trachinidse). Body ovate 



or elongate ; head compressed or cuboid ; 

 mouth and eyes mostly vertical ; body co- 

 vered with compact scales; ventral before 

 pectorals, very small in some. 



38. Family. — Flat-Heads (Platycephalidse). Head 



and body broad, and depressed ; eyes large, 

 vertical ; ventrals large ; dorsals two ; body 

 scaly ; no tubercles or filaments on head. 



39. Family. — Mailed-Bullheads (Agonidae). Body 



angulated, generally long and slender, co- 

 vered with mailed plates ; jaws prolonged, 

 somewhat tubular ; no teeth on vomer ; ven- 

 trals of two rays, very small. 



40. Family. — Bullheads (Cottidse). Head large, 



broad, depressed, armed with spines and tu- 

 bercles i mouth large ; small teeth on jaws 

 and vomer, none on palate ; body naked, or 

 with patches only of minute scales; dorsals 

 generally two, either separate, or united at 

 base ; ventrals small, imperfect, behind pec- 

 torals. 



41. Family. — Surmullets (Mullidse). Body obovate, 



anterior part thicker than posterior ; head 



