APPENDIX C. 
239 
Mochocus niloticus, Joannis. 
D. i|10. A. 8. P.1/3. V. 6. 
The length of the head is two-ninths of the total (without caudal) . 
Barbels subequal in lengthy scarcely longer than the head. Dorsal 
spine longer than the head^ but only two -thirds as long as the spine 
of the pectoral fin, which is exceedingly strong. Head, body, the 
second dorsal, and the caudal with brownish -black spots. 
Nile, near Thebes. Only eighteen lines long. 
Malapterurus. 
Body scaleless, thick, subcylindrical. Only one dorsal fin, which 
is adipose and situated before the caudal ; anal of moderate length, 
or short; caudal rounded; ventrals six-rayed, inserted somewhat 
behind the middle of the body ; pectorals without pungent spine. 
Barbels six : one to each maxillary, and two on each side of the 
mandible. Both jaws with bands of villiform teeth; palate eden- 
tulous. The entire head and body covered with soft skin. Eyes 
small. Gill-opening very narrow, reduced to a slit before the pec- 
toral. An electric organ extends over the whole body, and is 
situated between two aponeurotic membranes below the external 
integument. 
