424 



TELEOSTEI 



and 5 jointed dermal rays ; but the cranial bones are spiny, the scales 

 sometimes ctenoid (Stephanoberyx), and sometimes cycloid (Malacosarcus). 

 Stephanoberyx, Gill ; Malacosarcus, deep-seas (Fig. 428), 



FIG. 428. 

 Stephanoberyx monae, Gill. (From Jordan and Evermann.) 



Sub-Order 7. ACANTHOPTERYGII. 



The cranial dermal bones are mostly deeply sunk and often 

 covered over with scales (Fig. 43 4 A). The parietals are separated 

 by the supraoccipital in the middle line, with rare exceptions 

 apparently due to secondary growth (Scorpaenidae, Cottidae, Trig- 



FIG. 420. 

 SeorpaenOfuia ronca. Day. (After Day, Fishes of India.) 



lidae, and Zeidae (Ridewood [362]). The toothless maxilla is almost 

 or completely excluded from the margin of the mouth (Fig. 456). 

 The scales are ctenoid, and spines are generally developed on the 

 median and paired fins, and spiny processes on the opercular bones 

 (Fig. 429) ; the fin-spines show no sign of segmentation, unlike 

 those of the Ostariophysi they are rigid to the extreme tip ( Vaillant). 

 Perhaps the most remarkable and constant characteristic of the 



