2. ACRONUEUS. 345 



with round bluish spots anteriorly ; caudal fin entirely dotted with 

 bluish. 

 Mauritius. 



a. Fine specimen. Mamitius. From the Collection of the Zoological 

 Society. — Type of the species. 



43. Acanthurus riippellii. 



Aeanthm'us velifer, part., Cuv. Sf Val. x. p. 251. 



velifer, Riq^p. Atl. Fische, p. 58. taf. 15. fig. 2 ; Sleek. Cocos, iv. 



p. 451. 

 riippeUii, Benn. in Proc. Zool. Soc. 1835, p. 207 ; Bleek. Batoe, 



p. 31G. 



^•1- ^•2l^v Vert. 9/13. C^c. pylor. 7. 



The height of the body is one-half of the total length (the caudal 

 fin not included). Dorsal and anal fins elevated. Bluish-grey, with 

 six dark-brown cross-bands, which extend only to the middle of the 

 side : the first from the neck through the eye to the interoperculum, 

 dotted with yeUow, like the whole head and the thorax ; there are 

 seventeen to twenty yellow transverse lines on and between the 

 brown cross-bands, running parallel to them ; the lower half of the 

 belly with round yellowish spots. Dorsal and anal fins dark violet, 

 with yellow bands which are interrupted anteriorly, forming spots ; 

 seven bands on the dorsal and four on the anal fin. Caudal with 

 yeUow spots on the basal half, violet towards the margin, which is 

 blue. 



From the Eastern coasts of Africa to New Guinea. 



a. Stuffed. Red Sea. From Dr. HiippeU's Collection. 

 44. Acanthurus suillus. 



Renard, i. 14. fig. 82. 



Acantliiu'us suillus, Cuv. ^- Val. x. p. 254. 



This fish is known only from an old Dutch drawing, badly copied 

 by Renard, and considered by Valenciennes as allied to A. velifer on 

 account of its elevated dorsal and anal fins. It is represented as 

 light greyish-brown, minutely dotted and spotted with black. Fins 

 grey, with a reddish line along the base of the dorsal and anal fiuUs. 



Mauritius. 



2. ACRONURUS*. 



Acanthiu-us, sp., Cuv. Sf Val. x. p. 237. 



A single series of lobate incisors in the jaws. A moveable spine 

 in a groove on each side of the tail. Ventral fins composed of one spine 

 and several soft rays. One dorsal fin, the spinous portion of which 

 is of less extent than the soft. Anal spines three. Scales none ; skin 



* This name is taken from Gronow, who intended to apply it to the fishes of 

 tliis family. A doubtful species is — 



1. Acanthurus melas, Cuv. df- [?(/. x. p. 241. — Ceylon. 



