1. ACANTHURUS. 329 



Dr. V. Bleeker describes another species, which is probably an in- 

 dividual variety of^. triostegus ; the single specimen which occurred 

 was 29 millimetres long. 



Acanthurus pentazona, Bleek. Verhand. Batav. Genootsch. xxiii.. 

 Tenth, p. 13, and Java, i. p. 107. 



D. ^. A. i-. 



20 20 



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

 fin included). Caudal spine small. The upper profile of the snout 

 is convex ; caudal fin truncated. YelloVish, with five blackish 

 transverse bands, the anterior of which passes through the eye. 



Sea of Batavia. 



B. With two white cross-bands on the anterior part of the body. 



2. Acanthurus guttatus. 



Harpurus guttatiis, Forst. Descr. Anim. ed. Licht. p. 218. 

 Acanthurus guttatus, Bl. Schn. p. 215 ; Cuv. ^ Val. x. p. 195. 

 Chaetodon stellatus, L. Gm. i. p. 1269. 



D-i^s- A.^. V.1/5. 



Scales very small, smooth. The height of the body is two-thirds 

 of the total length (the caudal fin not included;. The upper jaw 

 with six truncated and deeply lobate incisors on each side. Caudal 

 spine terminating posteriorly in a projecting process. The upper 

 profile of the snout is subvortical and vciy slightly concave. Caudal 

 fin subtruncated. Brownish, with two whitish cross-bands : one 

 from the nape of the neck over the operculum, the other from the 

 fifth and six dorsal spines to the belly. Posterior half of the body, 

 dorsal and anal fins with nunierous round white spots. 



Otaheiti. New Hebrides. Mauritius. 



a. Adult : bleached. Otaheiti. From Forster's Collection. — Type 



of the species. 

 6. Adult : stufibd. Aneiteura. From Mr. Macgillivray's Collection. 



c. Adult. Mauritius. From the Collection of the Zoological Society. 



d. Adult : stuffed. Mauritius. 



C. Coloration of the body nearly uniform^ without conspicuous markiiigs. 



* (rronnd-colour brown ; sometimes a whitish ring round the base of the 



caudal ^n. 



3. Acanthurus chirurgus. 



Acarauna, Marcgr. p. 144. 



Barbero, Parra, lam. 21. fig. 2. 



Ilepatus, Gronov. Zoiqjhyl. no. 353. 



Chsetodon nigricans, Bl. iii. p. 82. t. 203 ; (not L.). 



chirurgus, Bl. t. 208. 



Acanthm-us nigricans, pt., Bl. Schn. p. 211. 



chirurgus, Bl. Schn. p. 214; Cuv. 4* Val. x. p. 168 ; Guichen. in 



Bamon de la Sagra, Cuba, Poiss. p. 120 ; Custeln. Anini. nouv. Am&r. 



Sud, Poiss. p. 24. 



