78 U.S. NATIONAL MUSEUM BULLETIN 202 Vol. 2 



information: (1) the black and white and the brown specimens differ 

 little in morphological featm-es or in counts; (2) ripe individuals of 

 both sexes occur in both color forms; and (3) though the two color 

 forms overlap in size ranges, the plain brown form is represented only 

 by specimens 47 to 70 noun., in standard length, whereas black and 

 white specimens range from 17 to 57 mm. In life both forms may be 

 seen over the same coral head." 



CHROMIS TERNATENSIS (Bleeker) 



Plate 83, C 



Heliases ternatensis Bleeker, Nat. Tijdschr. Nederl.-Indie, vol. 10, p. 377, 

 1856 (type locality, Ternate). 



SPECIMENS STUDIED 



Bikini Atoll: 1 station, 1 specimen, 60.5 mm. in standard length. 

 Rongelap Atoll: 1 station, 1 specimen, 41.5 mm. 



Description. — Dorsal fin rays XII,11; anal rays 11,11; pectorals 

 ii,15 or 16; transverse scale rows from upper edge of gill openuig to 

 base of caudal rsiys, 26, with 2 or 2^ between lateral line and origin 

 of dorsal, 9 between lateral Ime and origm of anal ; upper part of lateral 

 line with 1 6 tubular scales ; gill rakers 7 + 1+21. 



Depth of body 1.9 to 2.0; length of head 3.1 to 3.2; both in standard 

 length. Snout 3.4 to 3.6; eye 2.6 to 2.9; preorbital width 7.0 to 7.7; 

 length of upper jaw 3.0 to 3.2; postorbital part of head (hind margin 

 of eye to upper edge of gill openmg) 2.8 to 3.0; mterorbital width 

 2.9 to 3.1; depth of caudal peduncle 2.1 to 2.2; length of pectoral fin 

 0.9 to 1.0, of pelvics 0.9 to 1.1, of 3rd dorsal spine 2.2 to 2.3, of upper 

 caudal rays 0.6 to 0.7, of lower caudal rays 0.6 to 0.8; all in length of 

 head (tip of snout to posterior margm of opercular flap). Depth of 

 caudal peduncle in its length 1.4 to 1.5; angle of snout profile with 

 lengthwise axis of body 48 degrees. 



Body deep, compressed; teeth of jaws in 2 rows, outer row enlarged, 

 conical widely spaced near symphysis, closer laterally, inner row 

 smaller, close set, formmg band at symphysis; snout scaled to tip; 

 preorbital and suborbital fully scaled, the former wide, the latter 

 adnate, its margin not distmct, preopercular margin entu-e, posterior 

 margin not straight but slightly sigmoid ; upper branch of lateral line 

 ending beneath 3rd dorsal soft ray, bases of soft dorsal and anal 

 scaled; pectoral fin as long as or longer than head; 2nd anal spine 

 shorter than first anal ray; soft dorsal and anal fins pointed; caudal 

 lobes filamentous. 



Color in alcohol. — Top of head and back dark brownish; cheeks, 

 throat, and breast yellowish bro\\Ti, sides light grayish brown or yel- 

 lov.'ish brown; scales of back and sides with broad dark brown margin, 

 centers of scales paler; spiny dorsal membranes blackish; soft dorsal 



