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upper lip, posteriorly by a prolongation of the soft covering 

 of the jaw. Lower lip reflected, not continuous with the upper 

 lip and separated from the last named prolongation by a longi- 

 tudinal postlabial groove, which is divided by a longitudinal 

 fleshy frenulum in a median and a lateral part, the last of 

 which contains the maxillary barbel and the gutter-like pro- 

 longation. A pair of rostral barbels. Eye with a free orbital 

 margin. Dorsal without osseous ray and with 8 branched rays. 



Fig. 85. Lateral view of head of Fig. 86. Lower surface of head of 



Schismatorhynchus heterorhynchus (Blkr.) >< iV-i- Schismatorhynchus heterorhynchus (Blkr.) > 



a rostral barbel; b maxillary barbel, in fig. 85 exposed, in fig. 86 in natural position; 



/frenulum; hlj horny layer of lower jaw; //lower lip; p prolongation of the lip; 



;■/ rostral fold; til upper lip. 



Its origin in advance of that of the ventrals. Anal short, 

 with 5 branched rays. Caudal bifurcate. Pectorals subhori- 

 zontal. Scales large; lateral line straight, running in the middle 

 of the tail. Branchial openings rather wide. Gillmembranes 

 united with isthmus. Pharyngeal teeth 5.4.2—2.4.5, obliquely 

 truncate. 



Distribution: Fresh water of Indo-australian Archipelago 

 (Sumatra and Borneo) ; perhaps also represented on the Indian 

 continent. 



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