1898.] of the family moumtsid^. 801 



7. Gnathonemus. 



Mormyrops, part., Marcusen, Bull. Ac. St. Petersb. xii. 1854, 

 p. 14, and Mem. Ac. St. Petersb. (7) vii. 1864, no. 4, p. 113. 



Gnathonemus, G-ill, Proc. Ac. Philad, 1862, p. 443 ; Bouleng. 

 Ann. Mus. Congo, Zool. i. 1898, p. 2. 



Campylomormyrus, Bleek. Versl. Ak. Amsterd. (2) viii. 1874, 

 p. 367. 



Teeth in the jaws small, conical, truncate, or notched, few (3-7 

 in the upper jaw, 4-10 in the lower) ; minute conical teeth on the 

 parasphenoid and on the tongue ; mouth terminal (not below the 

 level of the lower border of the eye in the short-snouted forms). 

 Nostrils moderately far apart, remote from the eye. Body 

 moderately elongate ; ventrals equally distant from pectorals and 

 from anal, or nearer the former. Dorsal and anal uot very unequal 

 in length. Vertebra 45-48 (12-13 + 4-8 + 27-30). 



Synopsis of the Species. 



I. Snout shorter than postocular part of head. 

 A. Anal originating more or leas in advance 

 of dorsal. 



1. Dorsal 18-25. 



a. Teeth notched. 



D. 18-20 ; A. 2(i-28 ; no mental appendage or 



swelling; lat. 1. 51-56 : 12 scales round caudal 



peduncle 1. niger Gthr. 



D. 22 ; A. 28 ; skin with a long pointed dermal 



appendage; lat. 1. .58 2. lo iiffihar bis Kilg. 



D. 20-25 ; A. 25-29 ; chin with a globular 



swelling ; lat. 1. 43-49 ; 8 scales round caudal 



peduncle 3. moorii Gthr. 



D. 22 ; A. 28 ; chin with a globular swelling ; lat. 



1. 65 ; 12 scales round caudal peduncle 4. livingsfonii Blgr. 



D. 23 ; A. 34 ; chin with a globular swelling ; lat. 



1.58; 12 scales round caudal peduncle 5. bentleyiBlgr. 



b. Teeth conical. 



D. 23-24 ; A. 28-32 ; chin with a globular swelUng; 



lat. 1. 56-62 ; 14-16 scales round caudal peduncle. 6. macrolepidofus Ptrs. 



2. Dorsal 26-33. 



a. Teeth conical or truncate ; a globular 



mental swelling. 

 D. 26-28 ; A. 32-35 ; lat. I. 70-86 ; 16 scales round 



caudal peduncle 7. cyprinoides'L. 



D. 26-28 ; A. 31-36 ; lat. 1. 66-72 ; 12 scales round 



caudal peduncle 8. senegalemis Stdr. 



D. 28-31 ; A. 37^0 ; lat. 1. 70-80 ; 12 scales round 



caudal peduncle 9. stanleyamis Blgr. 



b. Teeth notched. 



D. 29-33 ; A. 36 ; chin with a globular swelling ; 



lat. 1.84-86; 12 scales round caudal peduncle. 10. mento Blgr. 

 D. 29-30 ; A. 36-38 ; chin with a short dermal 



appendage, as long as the eje ; lat. 1. 78-80 ; 12 



scales round caudal peduncle 11. monteiri Gthr. 



D. 27-29 ; A. 34-38 ; chin with a long dermal 



appendage, a little longer than the snout ; lat. 1. 



63-70; 8 scales round caudal peduncle 12. petenii Gthr. 



