174- ORDER ACANTHOPTERYG1I. 



within reach. It is a common pastime of the Chinese 

 at j ava 



Heniochus, Cuv., 



Differs from the true chsetodon, because the first 

 spines of the back, and particularly the third or fourth, 

 rapidly increase in length, forming a filament some- 

 times double the length of the body, and resembling 

 a kind of whip 2 . 



Ephippus, Cuv., 



Distinguished by a dorsal deeply emarginated be- 

 tween its spinous and soft portions ; the spinous part, 

 which has no scales, can be folded into a groove, 

 formed by the scales of the back. 



In one of the subdivisions there are three spines in 

 the anal fin and oval pectorals. 



America produces a species, Eph. gigas, Cuv., re- 

 markable for the great club-shaped enlargement of the 

 first interspinal of its dorsal and anal fins, and for a 

 similar inflation of the crest of the cranium 3 . 



1 Schlosser, Trans. Phil. 1707. p. 39. Add Ch. longirostris, 

 Brousson, Dec. Icthyol. 



1 Chcetodon macrolejiidotus, L., Bl. 200. 1 ; the Chcet. acuminatus, 

 L., Mus. Ad. Fred, xxxiii. f. 2. appears to be a mere variety 

 of it; the Chcet. cornutus, L., BL, 200. 2. of which the Chcet. 

 canescens, L., Seb. III. xxv. 7. is only a young uncoloured spe- 

 cimen. 



3 Add Chcetodonfaber, Brousson, Bl. 212. 2. of which the Chcet. 

 Plumieri, Id. 211. 1. may be a variety. Chcet. orbis, Bl. 202. 2. 



