334 ACfiOXFRID^. 



b, c, d. Adult and young. Ambo^-na. Purchased of Mr. Frank. 



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



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



lection. 

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

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

 four of the posterior interneurals and interhicmals 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 Oi 



-of the second vertebra Ig 



of the fourth 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 neui'al spine 10^ 



of the first haemal spine 15 



of the first intemeural spine 7 



of the first interhaemal spine 12| 



13. Acanthunis striatus. 



Quoi/ 4- Gaim. Voxj. TJran. Zool. p. .373, Poiss. pi. 63. fig. 3 (bad) ; Cur. 

 Sf Vul. X. p. 229. 



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

 fin not included). ProfUe 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. 63. 



Acanthui-us sohal, Bl. Schn. p. 215; Riipp. At/. Fische, p. 56. taf. 10. 

 fig. 1 ; Cm: Sf Vul. x. p. 227. 



carinatus, Bl. Schn. p. 216. 



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



D-n- ^-al^- Cffic.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. Grevish-violet, with about fourteen bluish longitudinal 



