GLAUCOUS CHiETODON. 



357 



have generally one or more round black spots to* 

 wards the middle: gill-covers without spine : mouth 

 small, and concealed as it were among several 

 membranaceous pleats into which the lips or edges 

 are disposed : eyes rather large : scales small : tail 

 even, or rounded : native region unknown. 



With single dorsal Jin, and forked or lunated tail 



GLAUCOUS CELETODON. 



Chsetodon Glaucus. C. corpore rhombeo-ovato, supra cceruko 



fasciis transversis nigris, subtus argenteo. 

 Blue Chaetocjon, with rhombic-ovate body ; the upper parts 



crossed by black bands ; the sides and abdomen silvery. 

 Chaetodon glaucus. Lin. Gmel. Block, t. 210, 



A highly elegant species: body rhombic-oblong: 

 colour on the upper parts fine blue, on the lower 

 silvery white with a tinge of rose-colour : on each 

 side the upper part of the body are five or six* 

 narrow black bands, descending only half way 

 down : dorsal and anal fin blue, very long, slightly 

 falcated, and reaching as far as the tips of the tail, 

 which is very widely forked : at the origin of the 

 dorsal fin are five pretty strong spines, but none 

 on the gill-covers : the scales are of moderate size. 

 This species is a native of the American seas, and 

 grows to a considerable size, often exceeding a foot 

 or eighteen inches in length, and is in considerable 

 esteem as a food. 



