255 
united into one, or only the vomerine patches united. 7—11 
branchiostegals. Gillmembranes united, their hindborder deeply 
notched, free from isthmus. 
Fig. 103. Pangasius de Zwaani 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. 
«, Band of vomerine teeth thrice broader than 
long; snout very prominent; eye totally 
above level of corner of mouth ...... P. nasutus p. 256. 
@. Band of vomerine teeth more than twice 
broader than long; snout slightly prominent; 
eye inferior, partly below level of corner 
CUCM Ce Fake etch avey eres ebay «wie ss, Ls POmpastMs p.\2E6: 
4. Band of vomerine teeth more than 1'/, times 
broader than long. A. 35—40..... .... L. polyuranodon p. 257. 
4. Vomerine teeth confluent with the palatine teeth 
into one broad) patch.”. 2...) .. 22:52... 2. micuwenhuisi p. 258. 
II. Vomerine teeth separate. 
A, Barbels much longer than head.......... P. macronema p. 259. 
4%. Barbels much shorter than head. 
a. Head 6 times, anal 3!/; times in length. .. P. de Zwaani p. 260, 
6, Head 4'/>—5 times, anal 31/,—4 times in 
length. 
a, Maxillary barbels much more than half 
head. (see for this species also above 
puder It) Be reeeee ode) tsi y. is Le) Pamoastiss. P.vesO: 
@. Maxillary barbels shorter than half head . P. micronema p. 261. 
