84 PR0CEEDTNG8 OF THE NATIONAL MUSEUM. vouxxiv. 
16. CHASMIAS Jordan and Snyder. 
Ch'i.smlns Jordan- and ^n'ydek, Proc. U. S. Nat. Mus., XXIII, 1!H)1, p. 761 
{iiiiK((/:tvs). 
Body nioderately olongate, cov^ered with veiy small, cycloid .scales; 
head ))road, Hattish al)ove, wide ])etween the eyes, the cheeks without 
scales; mouth very larg'e, horizontal, the lower jaw inchided; teeth in 
moderate bands; maxillary much pi'oduced backward; tongue broad, 
rounded; isthmus very broad, the gill openings restricted to the sides. 
Shoulder girdle without fleshy flaps; no barbels. Dorsal flns short, 
the first of 6 low, flexible spines; caudal rounded; pectorals with free 
silky tips above; no filamentous rays on dorsal; vcntrals short and 
broad. 
This genus is near to J-*I(d(/(/o7)H(>t Bleeker {uKicrorJiyncJiNs)^ difi'ering 
at least in the small, smooth scales and in the narrow gill openings. 
[XoiffpiaGy^ to 3^awn, from the large mouth.) 
(I. Vertical fins distincth; spotted or checkered with Ijlack; scales moderate, about 
60-20; de])th 6 in length; a black caudal spot (I'lUHnKjiiathus. 31. 
aa. Vertical fins dusky, nearly plain or dotted with white, and with a broad 
whitish margin; scales minute, about 90-30; depth 4| in length; a black 
caudal spot 7n isakins. 32. 
31. CHASMIAS DOLICHOGNATHUS ( Hilgendorf ). 
Gobius dulidiugnatliKif Hiu;endorf, Sitzljer. Naturf. Frcunde, 1S7S, p. 108, Tokyo; 
Mus. Berl., Nos. 1065, 10654. 
Head 8-| in length; depth 6; depth of caudal peduncle 2f in head; 
eye 5i ; snout 3 ; maxillary If ; D. VI-11 ; A. 10 ; P. 20 ; scales in 
lateral s(?ries 58, in transverse series 19. 
Body al)out like that of 0. mimknfs', the head somewhat smaller, 
the space between, the eyes narrower, and the snout shorter and more 
rounded. Eyes small; not directed upward; interorl)ital space wide, 
the distance between the eyes a little less than length of snout. 
Mouth nearly horizontal, very large; the maxillary extending to a 
vertical through a point posterior to the hinder margin of the eye, 
a distance equal to one-half the diameter of eye. Lower jaw included 
by the upper. Lips rather thick and pendulous. A fleshy flap before 
and below the eye hanging down over the lip. Teeth in narrow bands 
near middle of jaws, the posterior half of each side of jaw being 
naked; teeth villiform; those of upper jaw with a somewhat enlarged 
outer series ; phar^^ngeal teeth above and below stifl', l)ristle-like. 
Gill openings extending but little forward of the base of pectorals, 
the isthnms wide. Gill-rakers on first ai'ch 3 + 8, minute, slender. 
No papilhe on inner edge of shoulder girdle. 
Head naked; skiu but little wrinkled or folded; pores on head sim- 
ilar to those of O. inisakius. Anterior nostrils with tubes. Scales 
