1. CH^TODON. 21 



greatest height being about one-half of the total length. The upper 

 prohle of the head is very slightly concave above the orbit, and the 

 lower ascends as much as the upper descends. The length of the 

 snout equals the diameter of the eye, the width between the orbits 

 being rather less. The angle of the prasoperculum is nearly a right 

 one, and, hlie the lower margin, slightly denticulated. The dorsal 

 spines are moderately strong, and increase in length to the fourth and 

 htth, the length of which is rather more than one-half that of the 

 head The tol owing spines are very little shorter, and the last 

 equals m length the &st ray. The soft portion of the lin is not 

 elevated and rounded posteriorly. The caudal is truncated. The 

 anal spines are strong; the second is rather longer than the third 

 or than the dorsal spines, two-thirds the length of the head The 

 soft portion of the anal is very much Kke the corresponding part of 

 the opposite hn, but rather lower. The pectoral does not extend to 

 the vertical from the vent, the ventral reaches nearly to it The 

 scales are of moderate size; those between the pectoral and the 

 lateral line are the largest, one of them covering about one-half of 

 tne eye. 



I may add to the coloration stated above, that there is a shining 

 silvery spot on the operculum, perhaps of a colour different from 

 the ground colour m bfe ; that the brown band occupies the smaUer 

 portion of the soft dorsal, sometimes the posterior extremity only, 

 whilst on the anal it may extend forwards to the spines. The soft 

 dorsal has a fine brown marginal line posteriorly. The other fins 

 are uniform white. 



rr, , 1 ^ inches, lines, 



lotal length i o 



Height of the body 2 2 



Length of the head . . . . 1 



Diameter of the eye q 4 



Length of the fourth dorsal spine .' 7 



of the second anal spine 8 



cc. Body without bands, with stripes or spots, or uniform. 



aa. Ventrals dark-coloured. 



32. Chaetodon collaris. 



Seba, iii. 25. 10. 



Chretodon coUaris, £1. taf. 216. f. 1; M. Schn. p. 223; Cuv. 8f Val. 

 vu. p. bd ; meek. Verhand. Batav. Gemotsch. xxiii. aicetod. p. 19 

 Clisetodon imifasciatus, Gronov. Syst. ed. Gray, p. 69. 



D. ^. A.^. L. lat. 35. L. transv. 7/18. 

 The snout is obtuse and Httle longer than the diameter of the eye • 

 prJBoperculum serrated ; the soft dorsal and anal fins with the pos- ~ 

 tenor angle roimded. Body with many yeUowish oblique and lono-i- 

 tuchnal streaks, foUowing the series of the scales. The ociUar band 

 as broad as the eye, extencHng from the occiput to the root of the 

 ventrals, posteriorly on the neck mth a broad dark brown transverse 



