FRESH-WATER fishes of SIAM, or THAILAND 541 



large scales (23 to 26 in longitudinal series, 7 or 8 in transverse series, 

 and 5 to 7 in the predorsal region) ; reduced number (6) of branched 

 rays in the dorsal and anal fins; and coloration (5 rather diffuse dark 

 brown saddles on the back, a series of longitudinal elongated dark bars 

 along the side, transverse rows of dark spots on the second dorsal 

 rays, and 4 or 5 curved black transverse bars on the caudal fin). In 

 what appear to be only younger specimens the maxillary extends only 

 to a point under the pupil. A feature shown by all specimens regard- 

 less of size is a black line along the median ventral edge of the caudal 

 peduncle, with a thickening of the line into 3 elongate evenly spaced 

 spots, not mentioned in the original description. 



A series of 14 specimens, 2 to 3.2 cm. long, from the Bangpakong 

 River, July 1923, were pale and all were females having ripe or ripening 

 eggs. 



Genus GLOSSOGOBIUS Gill 



GlossogoUus Gnx, Proc. Acad. Nat. Sci. Philadelphia, 1859, p. 146. (Type, 

 OlossogoHus platycephalus Richardson). 



Features by which the gobies of this genus may be recognized are 

 depressed head, large mouth, strongly projecting chin, pluriserial teeth 

 with outer row canine or caninif orm, deeply notched or bilobed tongue, 

 wide gill openings, rather large ctenoid scales which extend to the 

 eyes, with a few on opercles, branched dorsal rays 8 to 10, and branched 

 anal rays 7 to 9. In addition to the two species shown in the key, 

 there are ascribed to Thailand several nominal forms {G. kokius, 

 G. circumspectus) which the writer follows Koumans (1935) in synon- 

 ymyzing with G. giuris. The two species definitely ascribed to Thai- 

 land are distinguishable as follows : 



Iff. A circular projection from upper iris into pupil ; 2 dark ocelli on first dorsal 



fin biocellatus 



1&. No projection from iris into pupil ; no ocellus on first dorsal fin giuris 



GLOSSOGOBIUS BIOCELLATUS (Cuvier and Valenciennes) 



Goiius 'biocellatus Cuvier and Valenciennes, 1837, vol. 12, p. 73 (Pondicherry). 



Eanging from eastern India to Malaya, East Indies, Philippines, 

 Australia, and Poljaiesia, this species has not been reported previously 

 from Thailand and it is apparently rare in that country. One speci- 

 men, 8.0 cm. long, was taken by the writer at Singora, in the Peninsula, 

 in October 1923, and another, 10.1 cm. long, in the Krat River, South- 

 eastern region, in December 1933, the latter representing about the 

 maximum size attained by the species. 



The peculiar extension from the upper part of the iris into the 

 pupil and the two dark ocelli on the spinous dorsal fin make identifica- 

 tion easy. 



