ACANTHUEUS. 57 



180. Acanthuras ctenodon. [493, 585.] 



Acanthurus ctenodon, Cuv. fy Val. x. p. 241, pi. 289 ; Giinth. Fish. iii. p. 342. 

 strigosus, Bleek. Nat. Tydschr. Ned. Ind. iv. p. 264, and vi. p. 102. 



T) JL_ A 3 



24-30" 22-27" 



Var. a [585] agrees with the specimens in the British Museum, described by Dr. 

 Giinther (I. c), especially with those from Amboyna. 



Var. b [493] is of a dark-brown colour, covered with minute pearly spots, which dis- 

 appear shortly after death. 



Zanzibar. Ceylon. East-Indian archipelago. New Guinea. New Hebrides. Caro- 

 line Islands. 



181. Acanthurus rhombeus. [278.] 



Acanthurus flavescens, Benn. Zool. Journ. iv. 1828, p. 40. 



rhombeus, Kittl. in Mus. Senckenb. i. p. 196, t. 13. f. 6 ; Gunth. Fish. iii. p. 342. 



scopas, Cuv. If Val. x. p. 245, pi. 290. 



■ altivelis, Cuv. fy Val. x. p. 249. 



Colour uniform brown, with a greyish band descending obliquely from the supra- 

 scapula to the middle of the side. 



Zanzibar. From Mauritius to Polynesia. Coast of Cuba. 



182. Acanthurus xanthurus. Plate VIII. fig. 4. [116. J 



Acanthurus xanthurus, Blyth in Kelaart's Prodr. Faun. Ceylan. Append, p. 50; Giinth. Fish. iii. 

 p. 343. 



D. 



24-25" 20-21* 



Height of the body rather more than two-thirds of the total length without caudal ; 

 snout rather produced ; about eight lobate incisors on each side of the upper jaw ; dorsal 

 and anal fins rather elevated ; scales minute, rough. 



Colour wholly black, with a golden-yellow tail ; pectorals yellowish. 



Aden. Coast of Ceylon. 



183. Acanthurus velifer. [9-] 



Acanthurus velifer, Bloch, ix. p. 106, t. 427. f. 1 ; Giinth. Fish. iii. p. 344. 

 blochii, Benn. in Proc. Zool. Soc. 1835, p. 207. 



Zanzibar. Sea of Batoe. 



184. Acanthurus desjardinii. [182.] 



Acanthurus desjardinii, Benn. in Proc. Zool. Soc. 1835, p. 127 ; Giinth. Fish. iii. p. 344. 



Zanzibar. Mauritius. 



This may prove to be only the adult state of Acanthurus velifer, Bloch. 



