GNATHONEMUS. 



117 



23. GNATHONEMUS GRESHOFFI. 

 Mormyrus greshoffii, Schilthuis, Tijdschr. Nederl. Dierk. Ver. (2) iii. 1891, p. 90, 



pi. yi. fig. 3. 

 Gnathonemus greshojji, Bouleng. Proc. Zool. Soc. 1898, p. 809, and Poiss. Bass. 



Congo, p. 100 (1901). 



Depth of body 2>\ to 3£ times in total length, length of head 4^ to 

 5 times. Head as long as deep or a little longer than deep, upper 

 profile descending in a curve ; snout \ length of head ; lower jaw with 

 a dermal appendage half the length of the snout ; teeth truncate, 3 in 

 upper jaw, 2 or 4 in lower ; eye large, situated in anterior half of 



Fig. 90. 



Gnathonemus gresJwffi. 

 Type. 



head, its diameter a little greater than length of snout or inter- 

 orbital width. Dorsal 31-36, originating a little in advance of anal, its 

 length twice in its distance from end of snout. Anal 29-32, nearer 

 base of ventral than base of caudal. Pectoral pointed, almost as long 

 as head, twice as long as ventral, extending beyond base of latter. 

 Caudal rather small, with pointed lobes. Caudal peduncle 4 or 5 times 

 as long as deep, as long as head. 72-80 scales in lateral line, 



13-16 



19-21! 



in 



11-14 



transverse series on body, j^ryg in transverse series between dorsal and 

 anal, 12 round caudal peduncle. Silvery, olive on the back. 



Total length 108 millim. 



Congo. 







1-3. Ad. 



Boma, Lower Congo. 



M. P. Delhez (C). 



4. Skel. 



1) )! 



f9 



5. Hgr. 



Kondue, ,, 



M. Lirja (€.). 



6- Hgr., type. 



Kinshassa, Stanley Pool. 



M. A. Greshoff (C). 



7. Ad. 



Dolo, ,, 



M. P. Delhez (C). 



8-9. Ad. 



Uerre. 



M. De Bauw (G). 



