FAMILY POMACENTRIDAE — WOODS AND SCHULTZ 63 



Remarks. — D. aruanus should not be confused with D. melanurus 

 Bleeker, which is illustrated in plate 81, E. 



DASCYLLUS RETICULATUS (Richardson) 



Plate 82,B,C 



Heliases reticulatus Richardson, Rep. Fifteenth Meet. British Assoc. Adv. Sci., 



p. 245, 1846 (type locality, China, Japan). 

 Dascyllus marginatus Fowler and Bean (not Riippell) U. S. Nat. Mus. Bull. 



100, vol. 7, p. 17, 1928 (part, see remarks). 



SPECIMENS STUDIED 



Bikini Atoll: 2 stations, 11 specimens, 14 to 50 mm. in standard length. 



Rongelap Atoll: 1 station, 1 specimen, 16 mm. 



Likiep Atoll: 1 lot, Univ. Washington, 1 specimen, 25 mm. 



Description. — Dorsal fin rays XII, 14 to' 16 (usually 15), anal 11,13 

 or 14 (usually 14) ; pectoral ii, 18 or 19; scale rows from upper edge of 

 gill opening to base of caudal rays 27 or 28, with 4 between base of 

 dorsal and lateral line and 11 between lateral line and origin of anal; 

 gill rakers 7 or 8+1 + 19 totaUng 27 or 28. 



Depth of body 1.5 to 1.6; head 2.7 to 3.3; both in standard length. 

 Snout 3.5 to 3.9; eye 2.0 to 2.8; preorbital width 6.5 to 8.4; length 

 of upper jaw 2.3 to 3.3; postorbital part of head (hind margin of eye to 

 upper edge of giU opening) 2.5 to 3.0; interorbital width 2.5 to 3.9; 

 depth of caudal peduncle 1.8 to 2.0; length of pectoral fin 0.97 to 

 1.1, of pelvics 0.8 to 0.9, of second dorsal spine 1.1 to 1.3, of upper 

 caudal ray 0.8 to 0.9; all in length of head (tip of snout to hind margin 

 of opercular membrane). Depth of caudal peduncle in its length 

 1.2 to 1.4; angle of snout profile with lengthwise axis of body 60 

 (young) to 76 (adult) degrees. 



Shape of body oval-eUiptical, preorbital and suborbital, preopercle 

 finely serrated, opercle entire except a flat rounded spine on upper 

 half, scales on snout to tip; fii-st dorsal spine about ji length of second, 

 second spine somewhat curved, subequal with 3rd; teeth in outer row 

 large, conical, widely spaced, inner row numerous fine, close-set. 



Color in alcohol. — Ground color light yellowish brown, margins of 

 scales darker brown on specimens 14 to 16 mm. with dark brown 

 vertical bar, slightly broader than pupil running from origin of dorsal 

 through base of pectorals to base of pelvics, a second vertical bar from 

 soft dorsal to anterior part of anal; in specimens 20 to 50 mm. the 

 posterior bar disappears leaving only anterior one which becomes paler 

 and narrower; in 60 mm. specimens the anterior bar has also disap- 

 peared leaving only the reticulated pattern of the scales; in specimens 

 of all sizes the spiny dorsal membrane is dark brown or blackish, base 

 of soft dorsal dusky; anal dark brown on basal % or eutu-ely dark brown 

 or black; caudal dusky brown on basal Ji; pelvics dark brown or 



