330 ACEONUEID-E. 



Acauthui'us plilebotomus, Cuv. l^ Val. x. p. 17G. pi. 287 ; Casteln. I. c. 



p. 25 ; Dekay, New York Fauna, Fishes, p. 139. pi. 73. fig. 234. 

 Acrouurus fuscus, Gronov. Syst. ed. Gray, p. 191. 



D.,i?56- ^-d^.- ^-l/S- C^c.pylor.5. 



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

 the total length (the caudal fin not included). The distance of the 

 nostiil from the edge of the upper jaw is two-thirds of the length of 

 the head. The upjier jaw with seven or eight lobate incisors on 

 each side. Caudal spine with a process posteriorly, pointing backwards. 

 The upper profile of the snout straight. Brownish: operculum with 

 black margin ; sometimes a whitish band across the end of the tail, 

 which, if present, occupies more of the scaly portion of the tail than 

 of the caudal fin. Other markings are rather inconstant : indistinct 

 darker transverse streaks ; undulated longitudinal lines in immature 

 specimens ; blackish longitudinal streaks on the dorsal and anal fins ; 

 a narrow whitish posterior edge of the caudal fin. 



Atlantic coasts of Tropical America and Africa. 



a-o. Adults, half-grown, and young : skins. Caribbean Sea. From 



Dr. Pamell's and Mr. Scrivener's Collections. 

 p-s. Half-grown and young. West Indies. Purchased of Mr. 



Scrivener. 

 t. Adult. Puerto CabeUo. Purchased of Mr. Brandt. 

 u. Half-grown : stuffed. Bahia. 

 V. Nineteen inches long : stuffed. 

 w, X. Adult. From the Haslar Collection. 

 y. Half-grown. : skin. From Gronow's Collection. 



4. Acanthurus matoides. 



Acanthurus nigi'icans, pt., Bl. Schn. p. 211. 



? Acanthuiais fuliginosus, Less. Voy. Coq. Zool. p. 149. pi. 27. fig. 2. 



? Acanthums rasi, Cuv. S,- Val. x. p. 203. 



Acanthurus matoides, Cuv. 8f Val. x. p. 204 ; Bleek. Verhand. Batav. 



Genootsch. xxiii., Tenth, p. 12. 

 annularis, Citv. ^- Val. x. p. 209 (immature specimens with a 



whitish caudal ring). 

 blochii, Cuv. &( Val. x. p. 209 (immatiu'e specimens -without a 



whitish caudal ring). 

 ? Aeanthm-us xanthopterus, Cuv. 8f Val. x. p. 215; Cuv. Begne Anitn. 



III. Poiss. pi. 71. fig. 2. 

 Acanthurus xanthopterus, Cant. Catal. p. 209. pi. 4. 

 Skeleton : Agass. Poiss. Foss. iv. p. 206. tab. F. (A. xanthopterus). 



^-.-h- ^-^s- ^-1/5. Vert. 9/13. 

 The height of the body is one-half or somewhat more than one- 

 half the total length (the caudal fin not included). The distance of 

 the nostril from the edge of the upper jaw is two-thirds of the length 

 of the head. The upper jaw with seven or eight lobate incisors on 

 each side. Caudal spine with a process posteriorly, pointing back- 

 wards. The upper profile of the snout is nearly straight in immature 



