42 Mr. Bennett's Observations o?i Fishes. 



curved at their tips, where they are considerably dilated and crenate. 



The scales which cover the body are crenate : they are larger than in the 

 typical species of Acanthuri, resembling those of the ^c. lineatus and 

 Ac. cceruleus. In another respect this species deviates also from the type 

 of the genus; its caudal aculeushas a very minute point directed back- 

 wards, a character which leads off to the Aspisuri, La Cep,, a subgenus 

 which in fact scarcely required to be separated from Acanthurus. 



Length 4 inches, breadth 2^ inches. 



11. Ch^todon Fremblii. 



ChoEt. griseo-jiavescens, lineis utrinque novem longitudinalibus, sub- 

 obliquis, nigi'escenti marginatis ; maculd pinnce dorsalis, caudalique 

 maxima, nigris, 



D. -Li. p. 14. V. i. A. -3-. C. 17. 



The prevailing colour is dull yellow inclining to griseous, marked on 

 each side with nine longitudinal pale blue lines which are margined 

 with black : the upper and lower of these pass along the extremity of 

 the scaly portions of the dorsal and anal fins ; the second as abbreviated ; 

 the four succeeding ones are directed somewhat obliquely upwards and 

 backwards. Five of these lines are continued forwards upon the head, 

 the lower one reaching almost to the angle of the mouth. Immediately 

 before the commencement of the dorsal fin is a black spot, and a large 

 black spot extends across the tail to the adjoining parts of the anal and 

 dorsal fins, on the latter of which it is much expanded. 



The spinous rays of the dorsal fin project considerably beyond the 

 membrane, which is pale fuscous with a blue line along its centre. 

 The caudal fin is even, inclining to crescent-shaped: it is transparent; 

 its scaly portion is bordered by a blackish crescent-shaped line, a second 

 slender line of the same colour and shape appearing near its extremity, 

 which is shghtly fuscous. The ventral fins are fuscous, clouded with 

 black. 



The rostrum is short ; the teeth are numerous, slender, and hair-like. 



Length 5 inches, breadth 3 inches. 



Dedicated to John Frembly, Esq., R. N., to whpm the Zoological Society 

 is indebted, not only for the several species here described, but also for 

 many others with which he has enriched its rapidly increasing collection. 



