246 GOBIES OF THE PHILIPPINES 



body covered with ctenoid scales not very regularly arranged, 

 the posterior ones largest, becoming smaller anteriorly, and 

 passing into cycloid scales, those before first dorsal very small ; 

 there is a patch of minute scales on base of pectoral ; the oper- 

 cles, preopercles, snout, top of head, and nape scaleless back 

 as far as front margin of opercles; the tip of tongue convex, 

 adnate; the gill openings wide and carried forward to a line 

 below the preopercles, the isthmus rather narrow; the dorsals 

 close together, both lower than body ; the ventrals long, the cau- 

 dal longer than head, lanceolate; no silky rays on pectorals. 

 Dorsal VI, 1-15; anal I, 16; scales in a longitudinal series, 100 

 to 110. 



But a single species is known. 



120. BIAT LUZONICUS Seale 



PLATE 20, FIG. 1 

 .Biat luzonica SEALE, Philip. Journ. Sci. , A 4 (1909) 532. 



Dorsal VI, 1-15; anal I, 16; there are 104 scales in a length- 

 wise series, 30 in a transverse series, and about 20 before first 

 dorsal. 



The body elongate, oblong, strongly compressed laterally, the 

 greatest depth 5.1 in length; the head large, blunt, broad, its 

 width equal to its depth, and contained 3.8 times in length ; the 

 snout short, steep, rather broad, with a conspicuous median 

 hump, and contained 4.2 times in head; the eyes large, very 

 high up but lateral in position, almost equal to snout in length, 

 4.4 in head; the interorbital space very narrow, its breadth 

 less than that of eye; the mouth moderately oblique, with 

 projecting lower jaw, the posterior angle of maxillary reaching 

 to pupil; the upper jaw has five rows of teeth, those of outer 

 row much enlarged and fixed, about four in the forward part 

 caniniform and curved backward, the other four rows of very 

 fine, sharp-pointed, depressible teeth; the lower jaw has three 

 rows of teeth, apparently all fixed, the inner row much the 

 shortest, of about five stout, curved canines on each side; the 

 nostrils in front of middle of eye, the anterior one small, closed 

 (tubulate?), the posterior one larger and open; above and about 

 midway between is a large pore; a large pore at anterior and 

 one at posterior end of interorbital space; a pore behind upper 

 part of eye, one behind middle of eye at beginning of supraoper- 

 cular groove and three more along it, and three on posterior 



