198 



frontborder of the snout, more approximated than the posterior 

 nostrils, which are valvulated, looking upwards, near the ver- 

 tical through the frontborder of the eye. Maxillary barbels 

 laterally from anterior nostrils, extending to the middle of the 

 anal. Mandibulary barbels at some distance behind symphysis, 

 extending on the first ! / 4 f tne anal. Origin of dorsal nearly 

 opposite to ventrals; its height about equal to postorbital part 

 of head. Anal confluent with caudal, which goes nearly 2 ! / 2 times 

 in length of body, and is superficially and asymmetrically incised, 

 with the lower lobe much shorter than the upper. Ventrals 

 reaching on anal, i ! / 2 times in head. Pectorals about equal to 

 head, their spine much shorter. Minute teeth in a curved band 

 in the jaws, those of the vomer in one very small median 

 patch. Brown above, distal part of caudal, of pectorals and 

 anal somewhat darker, barbels sometimes with dark brown 

 rings. Length 140 mm. 



Habitat: Sumatra (Taluk! Bagan api api!); Singapore; 

 Banka; Biliton ; Borneo (Sambas, Kahajan, Danau Sriang, 

 Sarawak). Malacca. 



In rivers. 



Doubtful species, 

 i. Silurichthys hasseltii Blkr. 



Silurichthys Hasseltii Bleeker, Ichth. Arch. Ind. Prodr. I Siluri, 1858, p. 270. 



Atl. Ichth. II. 1862, p. 82. 

 Silurichthys Hasseltii Vaillant, Nouv. Arch, du Museum, (4) v. 1893, p. 62. 



The type from Tjisekat, Java, examined by us in the Leyden 

 Museum, differs from the preceding species by the more 

 anterior position of the dorsal, which is situated in advance 

 of the ventrals as also stated by Bleeker and by Vaillant. 

 It is doubtful as is also expressed by Vaillant, that on this 

 character alone a new species can be founded. 



2. Silurichthys schneideri Volz. 



Sihirichthys Schneideri Volz, Revue Suisse Zool. XII. 1904, p. 463. 



D. 4; A. 64; P. I. 10; V. 7. 



Height 6'/2 times in total length (without caudal). Length 

 of head 7'/ 3 in same length. Upper and lower jaw equal. Gape 

 of mouth reaches laterally nearly vertically below frontmargin 

 of eye. The eye is small, its diameter only ! /? f total length 



