380 TELEOSTEI. ACANTHOPTERYGII. 



Length of head 4 to 4|, height of body a little over 2 in the 

 total length. Eyes diameter 2| in length of head, ^ diarn. from 

 end of snout. Colour deep brown; vertical fins dark, becoming 

 black at their edges. A white spot at nape, sometimes wanting, 

 a second above lateral line below middle of dorsal fin. 



Hob. Red Sea, east coast of Africa, Ceylon, to Polynesia. Com- 

 mon at Colombo. 



1224. (2.) Tetradrachnmm marginatum. (Fig. 127.) 



Pomacentrus marginatus, Riipp. Atl. Fische, p. 38, t. viii, fig. 2. 

 Tetradrachmum marginatum, Day, Fish. India, p. 381, pi. Ixxix, 

 fig. 7, Suppl. p. 800 (see synon.). 



D. 12/1 4-16. % P. 17. A. 2/12-13. C.17. L.I. 25-26. L.ti.3/12. 



Length of head 3| to 4, height of body 1| in the total length. 

 Eyes diameter 2 in length of head, to f diain. from end of 

 snout, and 1 apart. Body strongly compressed ; the profile, omit- 

 ting the tail, is nearly orbicular. Preorbital narrow. Fins dorsal 

 spines from the second to the last of about equal length ; caudal 



Fig. 127. Tetradrachmum marginatum. 



slightly emarginate. Colour bluish. A dark band passes from 

 first two dorsal spines, through base of pectoral to ventral. Snout 

 dark. Every scale on head, chest, and lower two thirds of body, 

 and a few on upper third with a bright blue black-edged spot. 

 Soft dorsal and caudal yellow ; spinous dorsal, ventral, and anal 

 black. 



Hob. Eed Sea, east coast of Africa, Andamans, Malay Archi- 

 pelago, China, and beyond. 



1225. (3.) Tetradraclmram aruannm. 

 Cbsetodon aruamis, Linn. Syst. Nat. i, p. 464. 



Tetradrachmum aiuanum, Day, Fish. India, p. 381, pi. Ixxx, fig. 6 

 (see synon.). 



D. 12-13/12-11. A. 2/11-12. L. 1.25-27. L.tr.3/10-11. C.pyl.3. 



Length of head 4, height of body 2* in the total length. Eyes 



diameter 2J in length of head, | diam. from end of snout, and 



