CORAL-FISHES. 161 



fish, the Arius (376, Wall-case 10, floor), a fish of the family 

 Siluridse. In some of the American forms, such as Cichla, the 



Fig. 73. — Bulti 7 Chromis idloticus. 



males develop on the top of the head a hump which disappears 

 after the breeding season. 



The Pomacentridse (662-666) are small fishes (see Dascyllus, 

 fig. 74) intermediate in character between the Cichlidse and the 



Coral- 

 fishes. 



Fig. 74. — Dascyllus aruanus, nat. size. 

 (From GLinther, "Study of Fishes.") 



Labridas, occurring in warm and tropical seas, frequently of 

 brilliant coloration, and living in the neighbourhood of coral reefs. 



M 



