1849.] Catalogue of Malayan Fishes. 1191 



Teuthis dorsalis, (Cuv. and Val.) 



Amphacanthus dorsalis, Cuv. and Val. X. 143. 

 Amphacanthus dorsalis, Schlegel and Muller: 1. c. 10, 13, Tab. 2, 



Fig. 1. 

 Kitang of the Malays. 



Head above and back pale brownish olive, lighter on the upper half 

 of the sides ; lower half and abdomen bluish white ; immediately 

 beneath the origin of the lateral line and in front of the pectorals pale 

 reddish lilac j back and sides with numerous small oval bluish white 

 spots ; cheeks and opercles pale metallic sulphur-coloured, opercles 

 edged with pale lilac ; pectorals transparent ; caudal pale brownish 

 olive, minutely dotted with brown ; rest of the fins greyish whke, 

 tinged with lilac, minutely dotted with brown. Iris yellowish white, 

 orbital margin olive. 



D 13/10, C 17|, A 7/9, V 1/3/1, P 16, Br. V. 



Habit. — Sea of Pinang. 

 Batavia. 



Total length : 6 inch. 



The length of the head is 4J in the total. The greatest, oblique, 

 diameter of the orbit is J of the length of the head. The greatest 

 vertical diameter of the body is \ of the total length. At Pinang this 

 species is numerous at all seasons. 



Gen. Acanthurus, Forskal 1775. 



(Harpurus, Forster 1778. — Aspidurus, Lacep. 1802.) 



Tail on each side armed with a strong moveable spine ; head and 

 body compressed ; eyes elevated ; mouth slightly cleft ; teeth in a single 

 series, trenchant, with crenulated margins ; dorsal single ; body covered 

 with minute scales ; branchiostegous rays five. 



Acanthurus xanthopterus, Cuv. and Val. 



Plate IV. 



Acanthurus xanthopterus, Cuv. and Val. X. 215. 



Young. Head and body violet brown, paler towards abdomen ; the 

 nostrils opening in a bright gamboge triangular spot, resting behind 

 on the anterior half of the orbit, the apex towards the middle of the 



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