FAMILY POMACENTRIDAE — WOODS AND SCHULTZ 97 



fringed, but in other respects, e. g., scalation of orbital and opercular 

 bones, number of dorsal fm spines, spiny dorsal outline, large number 

 of dorsal and anal fin rays, low number of gill rakers (especially on 

 upper branch), shape of body, and form of teeth of jaws, this species 

 resembles the other members of the subgenus Negostegastes. "Plectro- 

 glyphidodon" is intermediate in lip form between Negostegastes and 

 Cheiloprion Weber. Cheiloprion labiatus Day is thus related to the 

 Negostegastes group, but in that species the lips are very much thick- 

 ened, curled back, and fringed, in this species the jaw teeth are finer 

 than those in species of Negostegastes. 



Although both Cheiloprion labiatus and '^Plectroglyphidodon" 

 johnstonianus may be distinguished on the basis of their thickened 

 lips, nearly all the rest of their external characters are similar to 

 Abudefduf (Negostegastes) leucozona Bleeker, the type species of this 

 subgenus. If we recognize the genera Cheiloprion and Pleclrogly- 

 phidodon we lose sight of the close relationship to Negostegastes and if 

 we do not recognize them we perhaps do not sufficiently emphasize 

 their specialization. However, because of the relatively large number 

 of species involved it seems best to group these species in as large 

 natural groups as possible rather than separate each species that 

 shows some slight aberrance or specialization. 



ABUDEFDUF DICKI (Lifenard) 



Plate 86, E 



Glyphisodon dickii LiIsnard, Soc. Hist. Nat. Maurice, lO-"'- Rapp. Ann., p. 35, 

 1839 (type locality, Mauritius). 



SPECIMENS STUDIED 



Bikini Atoll: 6 stations, 10 specimens, 33 to 71 mm. in standard length. 

 Rongelap Atoll: 3 stations, 5 specimens, 41 to 48 mm. 

 Rongerik Atoll: 2 stations, 2 specimens, 58 to 66 mm. 

 Kwajalein Atoll: 1 station 6 specimens, 31 to 56 mm. 

 Guam: 1 lot, 1 specimen, 30 mm. 



Description.— BoTsnl fin rays XII, 17 or 18; anal 11,14 (rarely 13); 

 pectoral rays ii,15 to 17 (usually 17); transverse scale rows from 

 upper edge of gill opening to base of caudal rays 27 to 29 (usually 29), 

 with 3K or 4 between end of lateral Une and scaly dorsal sheath, 12 

 between lateral line and anal origin; upper part of lateral Hne with 20 

 to 22 tubular scales; gill rakers 2+1 + 12 or 13, totaling 15 or 16 

 (2 counts). 



Depth of body 1.7 to 1.9; head 2.7 to 3.3; both in standard length. 

 Snout 3.3 to 3.5; eye 2.3 to 3.7, preorbital width 6.4 to 11.3; length of 

 upper jaw 3.6 to 3.8; postorbital part of head (hind margin of eye to 

 upper edge of giU opening) 2.7 to 2.9; interorbital width 2.7 to 3.3; 

 depth of caudal peduncle 1.8 to 2.4; length of pectoral fin 1.0 to 1.3, 



