602 PROCEEDINGS OF THE NATIONAL MUSEUM. voi.xxiv. 
of orbit; its length equal to width of interorbital space. Teeth in a 
single row; lirnily embedded; 42 in upper jaw, 34 in the lower; incisor- 
like; broad anteriorly, the cutting edge scarcel}^ rounded; narrower and 
gradually becoming pointed posteriorly. Gill rakers on Urst arch 21; 
long, slender, with minute bristles on the sides, Preorbital narrow, its 
edge not notched. Edge of suborbital serrated; not adnate to cheek. 
Posterior edge of preopercle tinely serrated; the lower edge entire. 
Opercle with a rather large flat spine, above which are two closely 
opposed smaller ones. Scales ctenoid. Head with scales everywhere 
except on preorbital, symphysis of lower jaw and branchiostegal 
region. Body completely scaled. Dorsal and anal fins with a low 
sheath of scales along their bases, Interradial membranes of dorsal, 
anal, caudal, and pectoral fins with thin, oblong scales. Lateral line 
interrupted in the region of the seventeenth vertical row of scales, 
beginning again on the third row below, where it is represented by a 
single pit in each scale. Dorsal spines growing longer consecutively 
to the fourth; others of about equal length; middle rays of dorsal 
filamentous. First anal spine about one-half as long as the second; 
the latter a little shorter than the rays; posterior rays filamentous. 
Caudal deeply forked; the longest upper and lower rays filamentous. 
Pectoral pointed, the upper rays longest. First (outer) ray of ventral 
filamentous. Color violaceous; no distinct color marks on alcoholic 
specimens, except a faint dark spot immediately above gill opening; a 
small light brown spot at upper edge of base of pectoral; edges of 
unpaired fins narrowly washed with brownish; a narrow, indistinct, 
light band along the center of each lateral row of scales. 
This species is known to us from the types of Pomace^itrus rathhuni 
from near Yokohama. Renewed comparison with Bleeker's plates and 
a larger experience with the variation of these fishes have convinced us 
of the identity of the Japanese specimens with Bleeker's Pdmacentrus 
trlolascens. Bleeker's cyanomos and twiiiurm are certainly closely 
related. The species belongs to the typical group of Pomacentrus^ 
characterized by the short soft dorsal and deeply forked caudal. 
{mola.scenK, becoming violet.) 
5. POMACENTRUS CCELESTIS Jordan and Starks. 
Poinacentrus coelestis Jordan and Starks, Proc. Cal. Ac. Sci., 1900, p. 383, pi. xxi; 
Wakanoura. 
Head 8.5 in body; depth 2.8; eye 3.1 in head; maxillary 3.2; inter- 
orbital 4, equal to snout. Dorsal XHI, 14; anal II, 14; scales 2^- 
25-9, 
Body regularly ovate-oblong, the anteriod dorsal profile more con- 
vex than ventral. Interorbital space convex. Tip of snout on a level 
with lower margin of eye. Mouth small, slightly oblique, the jaws 
