108 ACANTHOPTERYGII. 



they were common for about a fortnight in June, after the commencement of the monsoon (Proc. Zool. Soc. 1865, 



P- 16 )- 



Bloch's type is of about equal length to Cantor's (5| inches), which it closely resembles. The specimen 



I have floured appears to be the young and proportionately much higher. The specimens of 0. collaris in the 

 British Museum resemble those of C. reticulatus at Paris. 

 Habitat. — Seas of India to the Malay Archipelago. 



13. Chastodon lunula. 



Pomacentrus lunula, Lacep. iv, pp. 507, 510, 513. 



Chcetodon lunula, Cuv. and Val. vii, p. 59, pi. 173; Bleeker, Gilolo, p. 57; Giinther, Catal. ii, p. 25 and 

 Fische d. Sudsee, p. 42, t. xxxiii, A, B, C, D. 



Chcetodon biocellatus, Cuv. and Val. vii, p. 62; Less. Voy. Duperr. Zool. Poiss. p. 176; Bleeker, Borneo, 

 p. 403 ; Giinther, Catal. ii, p. 9. 



B. vi, D. ^l, P. 19, V. 1/5, A. J^, C. 17, L. r. ffc &■ <*■ V^- 



Length of head 2/7 to 4/11, of caudal 1/6 to 2/13, height of body 4/7 of the total length. Eyes — diameter 

 2/7 of length of head, lj diameters from end of snout, and 1 apart. Preopercle serrated. Fins — the soft dorsal 

 and anal rounded, caudal slightly rounded. Lateral-line — ceases below the last third of the soft dorsal fin. 

 Colours — ocular band of a deep chestnut colour with white edges, and rather wider than the orbit, ending on the 

 edge of the preopercle : a second brown band passes from the five first dorsal spines and unites with the occipital 

 one : a third band from the fifth and sixth dorsal spines gradually widens and goes as low as the base of 

 the pectoral fin : a band along the base of the soft dorsal passes over the free portion of the tail : caudal with a 

 dark band in its posterior third : dorsal and anal with a dark edge and white margin. 



In the young the ocular band is edged with white, the vertical bands are badly developed, and a large 

 black white-edged ocellus exists in the centre of the soft dorsal. 



Habitat. — Seas of India, Andaman islands to the Malay Archipelago. 



14. Chaetodon melanotus, Plate XXVIII, fig. 1. 



Bl. Schn. p. 224 (not Reinw.) ; Klunz. Verh. z. b. Ges. Wien, 1870, p. 777. 



Chcetodon dorsalis, (Reinw.) Cuv. and Val. vii, p. 70 ; Rupp. Atl. p. 41, t. 9, f. 2 and N. W. Fische, p. 28 ; 

 Bleeker, Banda, i, p. 240 ; Giinther, Catal. ii, p. 28. 



Chcetodon marginatus, (Ehren.) Cuv. and Val. vii, p. 57. 

 , Chcetodon abhortani, Cuv. and Val. vii, p. 58. 



B. vi, D. if, P. 15, V. 1/5, A. -jJl., C. 17, L. 1. 37-40, L. tr. 6/16. 



Length of head 1/4, of caudal nearly 1/7, height of body 4/7 of the total length. Eyes — diameter 1/3 of 

 length of head, 1 diameter from end of snout, rather more apart. The maxilla does not quite reach to below the 

 front edge of the orbit. Preopercle very finely serrated. Fins — dorsal spines rather strong, increasing in length 

 to the fifth from whence they again diminish in height : soft portion of the fin also of the anal and the caudal 

 rounded. Colours — yellowish, having a narrow black ocular band descending from in front of the dorsal fin 

 through the middle of the eye, over the preopercle, interopercle, and on to the chest. The upper fourth of the 

 body stained with black and black lines along each row of scales, a black band over the free portion of the tail 

 but interrupted in the middle. Fins yellow, a narrow black intramarginal band along the soft portions of the 

 dorsal and anal fins with a white outer edge : a yellow band with a narrow black external edge down the centre 

 of the caudal, the last third of which fin is grey. A short black band at the base of the first four anal rays. 



Habitat. — Red Sea, seas of India to the Malay Archipelago and beyond, attaining at least 5 inches in 

 length. Schneider's type still exists in Berlin, it is about 4 T 3 u inches long. 



15. Chsetodon octofasciatus. 



Chcetodon octofasciatus, Gmel. Linn, i, p. 1262 ; Bloch, t. 215, f. 1 ; Bl. Schn. p. 223 ; Cuv. and Val. vii, 

 p. 17 ; Bleeker, Verh. Bat. Gen. xxiii, Chsetod. p. 16 ; Giinther, Catal. ii, p. 17 ; Kner, Novara Fische, p. 98. 

 Chcetodon octolineatus, Gronov. ed. Gray, p. 69. 

 B. vi, D. T J _l_ p. i9 ; v. 1/5, A. -fy-, C. 18, L. 1. 50, L. tr. 12/24. 



Length of head 1/4, of caudal nearly 1/6, height of body 2/3 of the total length. Eyes — diameter 1/3 of 

 length of head, nearly 1 diameter from end of snout and also apart. Preopercle a little rough along its edge, 

 especially at the angle, but not serrated. Fins — dorsal spines strong, increasing in length to the fourth, the 

 interspinous membrane deeply emarginate, soft portions of it and of the anal rounded : second anal spine the 

 strongest but not quite so long as the third : caudal cut almost square. Colours — buff, vertically banded, with 

 a central band along the snout to between the eyes : ocular band commences a short distance in front of the 

 dorsal fin, and passing through the eye (which is about twice its width), it crosses the cheeks and is lost on the 

 chest : the second goes from the third and fourth dorsal spines to behind the base of the ventral : the third 

 from the seventh dorsal spine to before the commencement of the anal : the fourth from the two last spines to 

 the first anal rays : the fifth from the first few dorsal rays to the anterior third of the soft anal : the sixth down 

 the last third of the soft dorsal across the free portion of the tail (where it increases in width) to near the 



