EEGAJN'^— MAEINE FISHES. 229 



Maxillary scai'cely reaching the vertical from anterior edge of eye. Head entirely scaly. 

 18 gill-rakers on the lower part of anterior arch. 27 scales in a longitudinal series. 

 Dorsal XII 15 ; spines gradually decreasing from the second, which is f the length of 

 head and as long as the longest soft rays. Anal II 14, rounded. Cavidal slightly 

 emarginate, with rounded lobes. Pectoral a little shorter than the head ; ventrals 

 reaching the origin of anal. Caudal peduncle as long as deep. Brownish grey ; each 

 scale with a blue spot ; lips blackish ; a blackish spot at the base of pectoral ; spinous 

 dorsal, ventrals, and anal blackish. 



Maldives. 



A single specimen, 65 mm. in total length. 



Closely allied to D. marginatus, Riipp., which has a deeper body (depth IJ in the 

 length), a smaller eye (diameter \ the length of head in specimens of 55 mm.), and the 

 soft vertical fins more produced (longest rays of soft dorsal longer than the second spine, 

 upper caudal lobe pointed). B. marginatus also differs somewhat in coloration, as the 

 lips are not blackish, the pectoral spot is larger, and only the upper half of the spinous 

 dorsal and the anterior half of the anal are blackish. 



64. Dascyllus melanurus, Blkr. 

 Maldives, Pelidu, 34 fathoms. 



65. Dascyllus ti'lmaculatus, Riipp. 

 Cargados Carajos, 20 to 30 fathoms. 



66. Dascyllus aruanus, L. 



Maldives ; Chagos Archipelago, Egmont and Salomon. 



67. Pomacentrus polylepis, sp. n. (Plate 24. fig. 3.) 



Depth of body 2f to 2f in the length, length of head 3|- to 3f . Snout shorter than 

 eye, the diameter of which is 3 to 3^ in the length of head and equal to the interorbital 

 width. Maxillary extending to the vertical from anterior edge of eye or a little beyond. 

 Snout, anterior part of interorbital region, prseorbital, and suborbitals naked. Praeoper- 

 ciilum serrated ; praeorbital and suborbitals entire. 47 to 50 scales in a longitudinal 

 series. Dorsal XIII 11-12 ; fifth, sixth, and seventh spines the highest, h the length 

 of head, a little longer than the longest soft rays. Anal II 12-13. Caudal deeply 

 forked. Pectoral nearly f the length of head ; ventrals not quite reaching the origin 

 of anal. Caudal peduncle a little longer than deep. Greyish violet, with blue longi- 

 tudinal stripes along the series of scales ; a dark spot at the base of pectoral ; vertical 

 fins dusky, 



Cargados Carajos, 20 to 30 fathoms. 



Two specimens, 54 and 80 mm. in total length. 



Allied to P. jerdoni. Day, but differing from all known species of Pomacentrus in the 

 small size of the scales. 



