1. ACANTHURUS. 327 



I. With nine or eight (seven) dorsal spines, with hroadjixea mcisors, and 



tvithjive soft ventral rays. 



A. With black cross-bands on the head and body. 



1. Acanthurus triostegus. 



Seba, iii. 25. 4 ; Russell, i. pi. 86. 



Chaetodon triostegus, L. Syst. i. p. 463. 



Acanthurus triostegus, S/. Schn. p. 215 ; Cuv. 8( Val. x. p. 197 ; Bkek. 



Verhand. Batav. Genootsch. xxui., Tenth, p. 13 ; Jenyns, Voy, Beagle, 



Fishes, p. 75. 

 llarpurus fasciatus, Forst. Descr. Anim. ed. Licht. p. 216. 

 Acanthurus zebra, Lacep. iv. p. 546. pi. 6. fig. 3. 

 Chaetodon zebra, Laclrp. iii. pi. 25. fig. 3. 



eouagga, Lacep. iv. p. 727. 



Acanthui-us hu'udo, Benn. Ceyl. Fishes, p. 11. pi. 11. 



Teuthis australis. Gray in King's Survey of the Coasts ofAustr.ii. p. 435. 



Acanthurus subai-matus, Benn. Whaling Voy. ii. p. 278. 



D.^. A.|. V.1/5. Vert. 9/13. 



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

 not included). The upper jaw with seven lobate incisors on each 

 side ; caudal spine small, without posterior projecting process. The 

 upper profile of the snout is concave. Caudal fin subtruncated. 

 Reddish-violet, with five blackish-brown transverse bands, the an- 

 terior of Avhich passes through the orbit ; another streak of the same 

 colour along the median line of the snout ; two brown spots, one 

 above the other, on the end of the tail. 



From Mauritius to Polynesia and New Zealand. 

 a-(J, e. Fine specimens. Amboyna. Purchased of Mr. Frank. 

 /. Half-grown : bad state. Celebes. Purchased of Mr. Frank. 

 g, h. Adult : bad state. Malayan Archipelago. Presented by Sir 



J. Richardson: 

 i. Adult : skin : bad state. Sandwich Islands. 

 k. Fine specimen. 'Anoiteura. From Mr. MacgiUivray's Collection. 

 I. Adult. West coast of Australia, From Captain King's Collection. 



— Type of Teuthis australis, Gray. 

 m, n, 0, p, q. Adult and half-grown. 

 r. Adult: stuffed, 

 s. Adult : skeleton. From the Collection of the Zoological Society. 



Skeleton. — The skull has a very peculiar physiognomy, from the 

 shortness of its cranial portion and the elongation of its front part, 

 in which, however, the jaw-bones do not participate. In general 

 form it is somewhat compressed, elevated, triangular. The crown 

 of the head is very short and convex, with the occipital crest 

 moderately developed ; the interorbital space is broad and flat. The 

 frontal bones and the prseorbital are prolonged, the bones situated 

 before them being very short. Turbinals well developed, united on 

 the median line. The jaws are formed as in Teuthis : the maxillary 

 ana intermaxillary are firmly and immoveably joined together, and 

 the latter has its posterior processes extremely short. The lower jaw 

 is broad and very short. Palatines very short ; all the bones of the 

 tympanic cavity are well ossified, and of rather large size; the epitym- 



