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tinued round the corner of the mouth. Postlabial groove 

 represented laterally only by a deep longitudinal groove, which 



//^^ 



Fig. 87. Tylognathus falcifcr (C. V.) X "/s 



divides the lower lip into a thick, fleshy superficial part and 

 a narrow deeper part, which is continued round the corner 

 of the mouth into the 

 upper lip. Lower jaw 

 with a thick fleshy co- 

 vering, carrying a deci- 

 duous horny sheath. A 

 pair of rostral barbels 

 present or absent. The 

 pair of maxillary bar- 

 bels hidden in a deep 

 groove" behind the 

 angle of the mouth. 

 Eye with a free orbital 

 margin. Dorsal without 

 osseous ray, with 8 — 9 

 branched rays ; its 

 origin somewhat in 

 advance of the ventrals. 

 Anal short, with 5 bran- 

 ched rays. Pectorals 

 short, subhorizontal. 

 Caudal forked. Scales rather large. Lateral line straight, running 

 in the middle of the tail. Pharyngeal teeth 5.4.2 — 2.4.5, uncinate. 

 Branchial opening rather ample, gillmembranes united with 

 isthmus. 



Distribution: Fresh water of Indo-australian Archipelago 

 (Sumatra, Java, Borneo) and Continental Asia. 



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t 





/''^f 



Fig. 88. Lower surface of head of Tylognathus 

 falcifcr (C.V.) X S'A- ^ rostral, <!; maxillary barbel; 

 /;■ lower jaw with horny sheath; /A/ deep-, //j super- 

 ficial part of lower lip; pig postlabial groove; 

 uj upper jaw with horny layer; ul upper lip. 



