334 ACRONTJIUD.E. 



h, c, d: Adult and young. Amboyna. Purchased ofMr. Frank. 



e. Foung. Philippine Islands. From Mr. Cuming's Collection. 



f. Adult: skeleton. Malay Archipelago. From the Haslar Col- 



lection. 



The skeleton differs very slightly from that of A. triostegus ; the 

 apophyses of the vertebrae axe rather more feeble, and three or even 

 four of the posterior interneurals and interhaemals correspond to one 

 neural or haemal. The last two caudal vertebrae have a prominent 

 ridge, which serves as the base for the external caudal spine. 



lines. 



Length of the first vertebra 04 



• of the second vertebra 1 1 



of the foui'th vertebra 1| 



of the tenth vertebra 2| 



• of the sixteenth vertebra 3 



of the twentieth vertebra 2| 



of the twenty-first vertebra 1,^ 



of the abdominal portion 16 



of the caudal portion 33 



of the twelfth neural spine lOi 



of the first haemal spine 15 



of the first intemeural spine 7 



of the first interhtemal spine 12| 



13. Acantlmrus striatus. 



Quay 8f Gaim. Voy. Uran. Zool. p. 373, Poiss. pi. 03. fig. 3 (bad) ; Ciit\ 

 8f Val. X. p. 229. 



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

 fin not included). Profile of the snout not concave. Brown, with 

 eleven or twelve straight bluish longitudinal streaks. 



Marianes. 



The specimens described are only 2| inches long. The following 

 appears to belong to this species : — 



a. 1| inches long. Borneo. 



14. Acanthurus sohal. 



Chaetodon sohal, Forsk. p. G3. 



Acanthurus sohal, Bl. Sclm. p. 215; Rdpp. Atl. Fische, p. 5G. taf. 10. 

 fig. 1 ; Cuv. 6f Val. x. p. 227. 



carinatus, Bl. Schn. p. 210. 



Aspisurus sohar, Lacep. iv. pp. -556, 557. 



^'k ^-dr,- C^c.pylor. 5. Vert. 9/14. 



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

 (the caudal fin not included). The anterior profile of the snout is 

 convex. Greyish-violet, with about fourteen bluish longitudinal 



