FKOM THE EIO JUKCA. 423 



three rays ; a small, elongate, horizontal black spot at the base of each lobe of the 

 caudal. 



Total length 62 millim. 



Three specimens. 



Closely allied to 0. stenopeltis Kner, which differs in the presence of an 

 occipito-nuchal groove, the smaller eye, the presence of dorsal shields, and the absence 

 of black spots on the fins. 



12. Oxydoras trachypaeia, n. sp. (Plate XL. fig. 2.) 



No teeth in the upper jaw. Depth of body equal to length of head, 3§ times in total 

 length. Snout rounded, rugose except in the internarial space on each side ; posterior 

 nostril close to the eye ; diameter of eye nearly equal to length of snout, rather more 

 than jj length of head, equal to interorbital width ; prseopercle, subopercle, and opercle 

 bony, rugose ; cranial bones granulate ; fontanelle not produced as a groove posteriorly ; 

 barbels not fringed (or, rather, maxillary barbels with a single basal barb), their bases 

 united by a fold of the lower jaw ; maxillary barbel not reaching opercular cleft ; 

 mandibular barbels short. Gill-cleft extending to below posterior border of eye. 

 Humeral process granulate, broader than and half as long as pectoral spine, obliquely 

 truncated posteriorly. Pectoral spine as long as dorsal, as long as head, strongly 

 serrated on the inner side, rather feebly on the outer. Dorsal I 6 ; spine rather 

 strongly serrated on both sides, a little nearer the adipose fin than the end of the 

 snout. Adipose fin half as long as anal. Anal 13. No shields between the dorsal 

 fins or on the belly. Lateral shields 33-34, nearly half as deep as the body, with 

 serrated border and rather feeble hooked spines. Caudal deeply bifurcate. Pale olive 

 above, whitish on the sides and beneath ; fins white. 



Total length 93 millim. 



Two specimens. 



This species, which further demonstrates the untenability of the genus Hemidoras as 

 distinct from Oxydoras, stands nearest to H. nattered Stdr., which differs in the fringed 

 maxillary barbels, the more forward position of the posterior dorsal, and the smaller 

 lateral shields. 



13. Oxydoras bachi, sp. n. (Plate XL. fig. 3.) 



No teeth in the upper jaw. Depth of body equal to length of head, 3f times in total 

 length. Snout obtusely pointed, covered with skin ; posterior nostril slightly nearer 

 the eye than the anterior nostril; diameter of eye | length of snout, J length of 

 head, § interorbital width ; cheek and opercle covered with skin ; skull striated above, 

 granulate on the sides ; fontanelle not produced as a groove posteriorly ; barbels not 

 fringed, their bases united by a fold of the lower jaw; maxillary barbels just reaching 



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