2I 9 



tinued round the corner of the mouth. Postlabial groove 

 represented laterally only by a deep longitudinal groove, which 



Fig. 87. Tylognathus falcifer (C. V.) X 2 /3 



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 Fig. 88. Lower surface of head of Tylognathus 

 advance of the Ventrals. f alci f er (C.V.) X 3V2- a rostral, maxillary barbel; 



Anal short, with 5 bran- '' lower J aw with ^ sheat *' ^ de ep ; ^ super- 



T> 1 ficial P art of l wer hP5 fV postlabial groove; 



Cned rays. rectoralS u j U pp er j aw w i t h horny layer; ul upper lip. 



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. 



