18-1 On tJie Genera Parexostoma, (■aimarrliichtliy?, &c. 



2. Chimarrhichthys Blythii. 



Exostoma Blythii, Day, Proc. Zool. Soc. 186'J, p. o2o) Fishes of luJia, 

 p. 501, pi. cxvii. lig. 2 (1678). 



llah, Northern Bengal. 



3. Chimarrhiclitliijs Fece. 



Exostoma Fece, Vincig. Aun. Mas. Geuov. xxix. 18DJ, p. 250, pi. viii. 

 fig. 6. 



Ilah. Kareniii Hills, Upper Burma. 



4. Chimarrliichthys macropterus. 



Exostoyna macrojderiaii, Vincig. Ann. Mas. Genov. xxix. 1890, p. 253, 

 pi. viii. fig. 5. 



llah. Kliakhyen IIi!l>:, Upper Burma. 

 Exostoma. 



Exostoma, Blyth, Journ. As. Soc. Bengal, xxix. 1801, p. 155; Giinth. 

 Cat. Fisli. V. p. 2U4 (1864). 



1. Exostoma Vincignerrce, sp. n. 



Exostoma luhiatinn (uon MacClell.), Vincig. Ann. Mus. Genov. xxix. 

 1890, p. 252. 



Depth of body about 1\ in the length, length of hea,d 5. 

 Head as broad as long. Diameter of eye 2 in the interocular 

 width, which is 3^ in the length of head. Snout twice as 

 long as postorbital part of head. Nasal barbel extending to 

 posterior margin of eye, maxillary barbel to anterior ^ of 

 pectoral. Outer mandibulary barbel not extending to base of 

 pectoral ; inner mandibulary barbel very small. Fold of the 

 lower lip continuous. Lower angle of gill-opening at the 

 level of the base of the pectoral spine. Dorsal 1 6, com- 

 mencing behind the extremity of pectoral j adipose tin long 

 and low, extending on to the caudal. Anal 1 5. Pectoral 

 with 10 branched rays, extending ^ of the distance from its 

 base to base of ventral. Ventral with 5 branched rays, not 

 reaching the vent. Caudal very slightly emarginate. 

 Caudal peduncle twice as long as deep. Uniformly brownish ; 

 fins pale. 



A single specimen, 80 mm. in total length, from the 

 Kliakhyen Hills, Upper Burma, collected by the late L. Fea. 



2. Exostoma Andersonii. 

 Exostoma Andersonii, Day, Proc. Zool, Soc. 18(39, p. 521. 

 IlaO. Yunnan. 



