54 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
lO. CTENOGOBIUS Gill. 
Ctenogohivs Gill, Fish. Trinidad, 1858, p. 874 (fasciatu.'i). 
Eucteno(jobius Gill, Ann. Lye. Nat. Hist., N. Y., 1859, p. 45 {hadms). 
Ehinogobius Gill, Proc. Ac. Nat. Sci., I*hila., 1859 {mnilis). 
Coryphopterus Gill, Proc. Ac. Nat. Sci., Phila., 1863, p. 263 {glaucofra'mim) . 
Acentrogohhis Bleeker, Archiv. Neerl., IX, 1874, p. 321 {c.hlorcMlgma). 
Zrmngoh'mx Bleeker, Archiv. Neerl., IX., 1874, p. 323 {nemifiisrirttHft). 
Body oblong, comprossed behind. Head oblong, not much de- 
prcs.sed. P^yes high, anterior, close together; opercles unarmed. 
Mouth moderate, the lower jaw u.'^ually shortest. Teeth on jaws only, 
conical, in few or several series, those in the outer row enlarged; no 
large canines; tongue usually truncate. Isthnnts l)road. Shoulder 
girdle without fleshy flaps or papilhe. Skull depressed, abruptly 
widened behind the eyes and without distinct median keel. Scales 
moderate or large, ctenoid, permanently covering the body; cheeks 
naked; opercles naked, or scaled above only; ])elly generally scaly. 
Dorsal with fJ rather weak spines; pectorals well developed, the upper 
rays without free or silk-like tips; ventrals completel}" united, not 
adnate to the belly; caudal fln usually obtuse. 
Species numerous in Asia and America. The genus Ctenog<>l)lnR^ as 
here understood, comprises a large number of species more or less 
closely related to the European genus Gohnm^ in which genus the 
species have been usually placed. The species of Gohlus are larger in 
size, with a difl'erent physiognomy and with silk-like free tips to the 
upper rays of the pectorals. 
(/cTf/g-, comb; Gohius.) 
I. Opercles scaly on the upper half; scales about 36; body with dark liands and 
streaks; first dorsal filamentous, with a black blotch on last rays; caudal 
streaked ahei. 11 
II. Opercles entirely naked. 
a. Nape with a naked area; head rather large; dorsal spines in adult filamentous. 
h. Scales 31; body rather robust; dorsal elevated in the adult and margined with 
white; caudal unspotted; l)ody olivaceous, with faint lateral l)lotches. 
Krmilh. 12 
hh. Scales 26; body more elongate; dorsals edged with black, finely spotted; 
caudal spotted above, the lower part abruptly without spots, l)ody with 
small spots gymnauchen. 13 
(la. Na])e closely scaled ; scales of body 26 to 28. 
c. Head large, 3 J in length; fins large; sides with 6 conspicuous black sjiots; 
dorsals spotted; caudal with faint wavy baud.s hndrnpterm. 14 
cc. Head moderate, a))out 4 in length. 
(/. Body sparsely covered with round dark spots, and with faint longitudinal 
stripes; dorsal spotted; caudal vaguely banded cionphcUi. 15 
(Id. Body without well-defined round l)lack spots; a Ijlack blotch at base of 
caudal. 
e. Sides with 5 distinct narrow streaks along the rows of scales; eye small, 
nearly 4 in head; no long dark blotch on chin and throat. 
virgatulus. 16 
ee. Sides without well defined stripes; eye large, 3^ in head ; branchiostegal 
region blackish .pjtaumi 17 
