255 



* 



united into one, or only the vomerine patches united. 7 u 

 branchiostegals. Gillmembranes united, their hindborder deeply 

 notched, free from isthmus. 



Fig. 103. Pangasitis de Zivaani M. Web. & de Bfrt. 



Artificial key to the species. 



I. Vomerine teeth united. 

 A. Vomerine teeth not confluent with the palatine teeth. 



a. Band of vomerine teeth more than twice 

 broader than long. A. 29 33. 



a. Band of vomerine teeth thrice broader than 



long; snout very prominent; eye totally 



above level of corner of mouth P. nasutus p. 256. 



/3. Band of vomerine teeth more than twice 



broader than long; snout slightly prominent; 



eye inferior, partly below level of corner 



of mouth p. pangasius p. 256. 



b. Band of vomerine teeth more than i'/2 times 



broader than long. A. 35 40 P. polyuranodon p. 257. 



B. Vomerine teeth confluent with the palatine teeth 



into one broad patch P. nienwenhnisi p. 258. 



II. Vomerine teeth separate. 



A. Barbels much longer than head P. macronema p. 259. 



B. Barbels much shorter than head. 



a. Head 6 times, anal 3 ] / 5 times in length . . . P. de Zivaani p. 260. 



b. Head 4^3 5 times, anal 3Y-2 4 times in 

 length. 



ae. Maxillary bai'bels much more than half 



head, (see for this species also above 



under I. A.} P. pangasius p. 256. 



|3. Maxillary barbels shorter than half head . /'. niicronema p. 261. 



