SINGLE-SPOTTED CHjETODON. 335 



of its colours, the fore-part of the body being milk- 

 white ; the hind-part reddish brown, passing through 

 the dorsal and anal fins, which are both edged with 

 white : the tail, pectoral, and ventral fins are also 

 white: the gill-covers are furnished with a very- 

 strong spine : the dorsal and anal fins are nearly 

 covered with scales, and are of moderate breadth, 

 extending into an acuminate form above and below 

 the tail, but not reaching to the tip : the body is of 

 an oblong-ovate shape. Native of the Indian and 

 American seas. 



SINGLE-SPOTTED CHjETODON. 



Chaetodon Unimaculatus. C. argenteus, supra ccerulescens, 

 corpore subrotundo^ovato macula utrinque versus dorsum nigra. 



Silvery Chsetodon with roundish-ovate body marked on each 

 side towards the back by a black spot. 



Chaetodon unimaculatus. Lin. Gmel. Block, t. 201. 



Shape roundish-ovate : colour silvery white, with 

 a few obliquely transverse yellow streaks, and tinged 

 on the upper parts with blue-grey : body covered with 

 large scales, and marked on each side, towards the 

 back, with a large oval black or deep-brown spot : 

 the head is marked, as in some others of this tribe, 

 by a deep-brown band, running across the eyes : 

 the base of the tail, and the edges of the dorsal and 

 anal fin are also brown : the tail is even at the end, 

 or, at most, so very slightly lunated as to be scarce 

 perceptibly so. Native of the Indian seas. 



