FRESH-WATER FISHES OF SIAM, OR THAILAND 543 



CREISSON SEALEI H. M. Smith 



Creisson sealei Smith, 1931a, p. 41 (lower Meuam Chao Phya). 



Possessing the outstanding generic characters of the genotype, 0. 

 vnlidus Jordan and Seale from the Philippines, this species may be 

 distinguished therefrom in that it has about 40 scales in longitudinal 

 series (against 29 to 32), 13 scales in transverse series (against 10 or 

 11), 34 scaler between the first dorsal fin and the eyes (against about 

 17), branched anal rays 9 (against 7 or 8), markedly different color- 

 ation of dorsal and caudal fins, and other characters. The type, 15 

 cm. long, taken in the Menam Chao Phya at Paknam, May 30. 1930, 

 remains unique. 



Genus OLIGOLEPIS Bleeker 



Ollgolepis Bleeker (453), Arch. Neerl. Sci. Nat., vol. 9, p. 318, 1874. (Type, 

 Gobius nielanostigma Bleeker.) 



OLIGOLEPIS MOLOANUS (Herre) 



Aimrrhis moloanus Herbe, 1927, p. 207 (Panay, Philippine Islands). 

 OHgolepis moloanus Smith, 1933a, p. 80 (Chantabun Estuary). 



This fish, described as new by Herre (1927) from the island of 

 Panay, Philippine Islands, and placed in the genus Aparrius of Jordan 

 and Eichardson (1908, p. 27S), is regarded by Koumans (1931, p. 74) 

 as belonging in the genus Ollgolepis of Bleeker after an examination 

 of a specimen, Gohius acutipennis Cuvier and Valenciennes, the type 

 species of Aparrius. 



Genus CTENOGOBIUS Gill 



Ctenogohius Gill, Ann. Lye. Nat. Hist. New York, vol. 6, p. 374, 1858. (Type, 

 Ctenogobius fasciatus Gill.) 



The fishes herein placed in the genus Ctenogobius (1858) have been 

 variously allocated by different authors at different times in Rhino- 

 gobius of Gill, Tukugobius of Herre, etc. Ctenogobius was based on a 

 fish {G. fasciatus) from the fresh waters of Trinidad, but the original 

 description was inadequate and partly inaccurate, and, in the absence 

 of a type specimen, some doubt has persisted as to certain characters, 

 although Gill subsequently amplified and corrected his description. 

 The genus Rhinogobius dates from 1859 and was based on a species 

 {similis) from Japan. This species, with many others, was called 

 Ctenogobius by Jordan and Snyder (1901, p. 54) ; but Jordan, Tanaka, 

 and Snyder (1913, p. 340) suppressed Ctenogobius and used Rhino- 

 gobius for the same group of fishes. Koumans (1931, p. 88) synony- 

 mized Rhinogobius with Ctenogobius, stating that he had examined 

 specimens of the type species of Ctenogobius and Rhinogobius and 

 could find no points of difference for separating the genera. Finally, 



