94 MORMTRIDiE. 



7. GNATHONEMUS. 

 Mormyrus, part., Linn. Syst. Nat. i. p. 522 (1766) ; Glinth. Cat. Fish. vi. p. 214 



(1866). 

 Mormijrops, part., Marcusen, Bull. Ac. St. Petersb. xii. 1854, p. 14, and Mem. Ac. 



St. Petersb. (7) vii. 1864, no. 4, p. 113. 

 Gnathoneiniis, Grill, Proc. Ac. Philad. 1862, p. 443 ; Bouleng. Proc. Zool. Soc. 



1898, p. 801, and Poiss. Bass. Congo, p. 89 (1901) ; Pappenh. Mitth. Zool. 



Mus. Berl. iii. 1907, p. 352 ; Bouleng. Fish. Nile, p. 48 (1907). 

 Campylomormyms, Bleek. Versl. Ak. Ainsterd. (2) viii. 1874, p. 367 ; Pappenh. 



t. c. p. 357. 



Teeth in the jaws small, conical, truncate, or notched (3-10 upper, 

 4-10 lower) ; minute conical teeth on the parasphenoid and on the 

 tongue ; mouth terminal. Nostrils moderately far apart, remote from 

 the eye. Body moderately elongate ; ventral fins equally distant from 

 the pectorals and from the anal, or nearer the former. Dorsal and anal 

 fins not very unequal in length. Vertebrae 44-49 (10-14 + 4-8 -|- 27-30). 



Nile and Tropical Africa. 



Synopsis of the Species. 



I. Snout shorter than postocular part of head. 

 A. Anal originating in advance of dorsal. 

 1. Teeth notched or bicuspid. 



a. 8 scales round caudal peduncle, which is 2^-3 time's as long as deep. 

 a. A globular mental swelling. 

 D. 20-25 ; A. 25-33 ; L. 1. 43-49 ; depth 

 of body 3-3| times in total length ; 



pectoral reaching beyond base of ventral. 1. G. moorii, Gtlir., p. 96. 

 D. 23-24; A. 26-28 ; L.l. 44-45 ; depth of 

 Ijody 3|— 4 times in total length ; pectoral 



just reaching base of ventral . . . . 2. G. lamhoun, Pollegr., p. 97. 

 D. 27-28 ; A. 33 ; L. 1. 49-54 ; depth of 

 body 4 times in total length ; pectoral 



reaching beyond base of ventral . . . 3. G. schilthumce, Blgr., p. 98. 

 j3. A long, cylindrical, tapering mental appendage. 

 D. 27-29; A. 34-36 ; L. 1. 63-70; depth 



of body 3-|-4| times in total length . . i. G. peterni, Gthr., p. 99. 

 h. 10-12 scales round caudal peduncle. 



a. Caudal peduncle not twice and \ as long as deep. 

 * A long, cylindrical, tapering mental appendage. 

 D. 22-25 ; A. 28-30 ; L. ]. 58-64 ; depth 



of body ^-^ times in total length . . 5. G. long/'barhis, Hilg., p. 100. 



