1. ACANTHURrS. 335 



streaks along the side, separated by black interspaces ; vertical fills 

 black, edged with blue. 



Northern parts of the Red Sea. 



a. Adult. Red Sea. From Dr. RiippeU's Collection. 



15. Acanthurus undulatus. 

 Cuv. fy Val. X. p. 205. 



^' 26* '^- 24- 



The height of the body is rather more than one-half of the total 

 length (the caudal fin included). Profile of the snout nearly straight. 

 Light brown, with twelve or thirteen undulated whitish lines, as- 

 cending posteriorly ; dorsal and anal fins brownish. ( Val.) 



Indian Ocean. 



16. Acanthurus dussumieri. 

 Cuv. ^ Val X. p. 201. 



■^•26- ^'^i- 



The height of the body is rather less than one-half of the total 

 length ; the anterior profile of the snout is slightly convex ; the length 

 of the head is contained twice and two-thirds in its height. Caudal 

 fin slightly cmarginate. Dark brown, with very numerous, fine, 

 rather irregular bluish longitudinal Unes, and with some spots of tlie 

 same colour on the thorax and the caudal fin ; base of the dorsal fin 

 with bluish and reddish longitudinal streaks ; a rose-coloured band 

 between the eyes. {Val.) 



Mauritius. 



17. Acanthurus grammoptilus. 

 Richards, in Ann. 8f Mag. Nat. Hist. 1842, xi. p. 176. 

 D -?- A ^ 



The height of the body is two-sevenths of the total length (the 

 caudal fin not included). The profile of the snout is rather convex. 

 Nine lobate teeth on each side of the upper jaw. Brown (in a dried 

 state), with very numerous undulated and irregular bluish longitu- 

 dinal lines ; a whitish band across the basal portion of the caudal fin ; 

 posterior half of the pectoral yellowish ;. dorsal fin with five dark 

 longitudinal lines ; anal wdth a light line, along and within the mar- 

 gin ; dorsal and anal fins with a black spot posteriorly in the axil. 



Port Essing-ton. 



n,h. Skins. Types of the species. 



18. Acanthurus bleekeri. 

 Acanthurus mata, BUek. Java, ii. p. 432 ; (not Cuv. (§• Val.). 



25 23 



The height of the body is nearly one-third of the total length (the 



