160 



PISCES, 



SUB-CLASS II. OSSEL 



Skeleton formed of bone; skull composed of 

 many distinct pieces. 



Jaw-bones soldered together . . Plectognathi. 

 Jaw-bones free : 



Gills arranged in tufts .. 

 Gills in comb-like fringes : 



Fin-rays soft, jointed .. 



Fin-rays (partly) spinous 



Lophobranchii. 



Malacopterygii. 

 Acanthopterygii. 



Order I. PLECTOGNATHI. 



Skeleton partly of bone, partly of cartilage ; 

 jaws formed by the soldering together of the 

 maxillaries and inter-maxillaries / arch of the 

 palate united to the skull ; mouth small, almost 

 motionless ; gill-opening small ; body usually short 

 and thick. 



Batistes (Linn.). File-fish. Body compressed, 

 covered with lozenge plates ; first dorsal spinous ; 

 cutting-teeth in both jaws. 



B. capriscus. Fig. 240 ; J n. s. 



