70 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 62. 
Family GOBIIDAE. 
RHINOGOBIUS GYMNAUCHEN (Bleeker). 
Head, 34; depth, 44; D. VI—I, 9; A. I, 9; P. 20; V. I, 5; scales, 30 
in median lateral series from gill-opening above to caudal base and 2 
more on latter; 11 scales traversely between soft dorsal and anal ori- 
gins; head width, 13 in its length; head depth at occiput about 14; 
snout, 34; eye, 32; maxillary, 3; interorbital, 64; third dorsal spine, 
1$; third dorsal ray, 14; caudal, 14; third anal ray, 24; pectoral, 14 
ventral, 12; least depth of caudal peduncle, 24. 
Body rather robust, moderately compressed, apparently deepest 
about middle of spinous dorsal, edges all convex. Least depth of 
caudal peduncle 1$ its length. 
Head robust, slightly wider than deep, profiles convex and cheeks 
with shght swollen appearance. Snout convex over surface and in 
profile, length two-thirds its width at front eye edges. Hye large, 
ellipsoid, high, superior-lateral, and hind pupil edge slightly before 
center in head length. Mouth large, terminal, inclined moderately. 
Maxillary reaches opposite front eye edge. Lips rather broadly 
fleshy. Band of small simple conic teeth in each jaw and an outer 
series in each jaw enlarged and curved. No teeth on roof of mouth 
or on tongue. Latter wide, depressed, free and with convex edge in 
front. Inner buccal folds narrow. Mandible strong, rather deeply 
convex. Nostrils two simple pores, hind one little before last fourth 
in snout profile and front one nearly midway in snout profile. Inter- 
orbital narrowly convex ridge. Preorbital width slightly greater 
than pupil, though a little less than eye. 
Gill-opening forward until about opposite last fourth in head. 
Gill-rakers, 1--5, lanceolate, short, barely half of gill-filaments, 
which about 3 in eye. Isthmus wide, level. 
Scales large, well exposed, in even longitudinal rows on trunk. 
Head largely naked, only few small cycloid scales on opercles, mostly 
above. Lower cheek with four horizontal series of close-set pores, 
indistinct, two short parallel horizontal series across opercle above, 
vertical series close behind preopercle edge and horizontal series 
across opercle. Scales on predorsal and occipital region sparse, 
small, weakly cycloid and obsolete. Except rather small scales on 
caudal base, all other fins naked. Scales with 20 to 24 convergent 
basal radiating striae, apical denticles about 50, graduated larger 
above and below, and circuli fine. 
Spinous dorsal inserted behind pectoral base. Fin, rounded and 
depressed, reaches back little beyond front of soft dorsal. Latter 
inserted little nearer caudal base than snout tip. Anal inserted 
opposite soft dorsal origin. Caudal rounded, likewise pectoral, and 
ventral nearly long as pectoral. Vent close before anal. 
