APPENDIX C. 
.219 
Clarias macracanthus, Gthr. 
D. 70—75. A. 54—55. P. 1/9. 
Vomerine teeth granular^ forming a band^ which in its middle is 
twice as broad as that of the intermaxillaries^ and which in the 
middle of its posterior margin has a very short inconspicuous pro- 
cess. Head coarsely granulated above, its length being a little 
more than one-fourth of the total. Barbels of moderate length, 
those of the nostril being two-fifths as long as, and those of the 
maxillary extending to the end of, the head . The pectoral fin 
reaches to the vertical from the origin of the dorsal ; the length of 
its spine is three-quarters, or rather' more than two-thirds, of that 
of the fin. 
Valenciennes has described a species under the name of Clarias 
hasselquistii (Cuv. k. VaL, Vol. XV., p. 36.2., pi. 446.) Among 
the numerous examples from the Nile which I have examined, I 
have not met with one which would agree with Valenciennes^ s de- 
scription of his Cl. hasselquistii : it is said to have very short bar- 
bels, the nasal being only one-fourth, and those of the maxillary 
one-half, of the head. The vomerine teeth are described as villi- 
form> forming a hand etroite, assez large et retrecie dans le milieu.^^ 
The figure represents this band with a very prominent median 
posterior process. 
Heterobranchus. [Karmouth). 
Very similar to Clarias, but the back is occupied by a long dorsal 
fin divided into two portions, an anterior which is rayed, and a 
