BY W. MACLEAY, F.L.S. 01 



in front. The eye is large, its diameter "being about twice and 

 a-lialf in the length of the head ; snout very short ; teeth large, 

 square, truncate ; praeorbital with two spines the upper one long 

 and straight, the other half the length. The operculum has five 

 or six moderate and equal obtuse teeth on the lower edge. Black, 

 with the sides of an olive yellow ; four pearl-coloured cross-bands, 

 bordered with black, one on the posterior part of the head, one 

 towards the middle of the body and two on the tail. 

 Cape York, (Castelnau). 



Genus Dascyllus, Cuv. 



Prreoperculum and sometimes the pra)orbital serrated. Teeth 

 small, villiform, in a narrow band, with an outer serier of some- 

 what larger ones. Dorsal fin with twelve or thirteen spines, anal 

 with two. Scales of moderate size, in less than thirty transverse 

 series ; the lateral line ceases below the soft dorsal fin. Branchi- 

 ostegals five ; pseudobranchire ; air-bladder large ; pyloric 

 appendages t\vo or three. 



Indian and Polynesian Seas. 



662. Dascyllus aruanus, L. 



Gunth., Cat. Fishes IV., 12. 



Tretradachmum arcuatum, Cant. — Bleek., Atl. Ichth. Pomac, tab. 



10, fig. 6. 



D. 12/12. A. 2/12. L. lat. 26-27. L. transv. 3/9. Csec. pylor. 3. 



Tert. 12/14. 



Three black cross-bands : the first descending obliquely from 

 the oi'igin of the spinous dorsal fin through the orbit to the chin, 

 leaving a greyish patch on the forehead ; the second slightly 

 curved, from the sixth to ninth dorsal spines to the ventral fins, 

 which are black ; the third from the soft dorsal to the anal ; 

 dorsal and anal fins black ; caudal whitish. 



Queensland (Castelnau). 



