186 ^Ir. G. A. Bouleiigei oji new 



XX, — Descriptions of new Freshioater Fishes discovered 

 by Mr. G. L. Bates in South Camei'oon. By G. A. 

 BOULENGER, F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



Mormyrops batesianus. 



Depth of body 6 times in total length, length of head 

 5 times. Head 1^ times as long as deep, with curved upper 

 profile J snout rounded, projecting a little beyond the mouth ; 

 width of mouth a little greater than length of snout ; 

 teeth truncate, 16 in upper jaw, 18 in lower ; ej-e in anterior 

 third of head, its diameter 2^ times in length of snout or 

 interorbital width. Dorsal 30, | length of anal, originating 

 nearly twice as far from end of snout as from base of caudal. 

 Anal 45, originating a little in advance of dorsal (8th i*ay 

 corresponding to first dorsal). Pectoral ^ length of head. 

 Caudal rather small, densely scaled, with rounded lobes. 

 Caudal peduncle twice as long as deep, half length of head. 

 102 scales in lateral line, ^g in transverse series on body, 25 

 in transverse series between dorsal and anal, 18 round caudal 

 peduncle. Uniform dark brown above, a little lighter 

 beneath. 



Total length 280 mm. 

 Closely allied to M. masuianus, Blgr. 



A single specimen from Assobam, Bumba River. The 

 Bumba River unites with the Ja at Molundu, where the two 

 form the Ngoko, which name is given to the river between 

 Molundu and the Sanga, an affluent of the Congo. Examples 

 of five lurther Mormyrids were obtained by Mr. Bates at Asso- 

 bam : — Petrocephalus simus, Sauv., Marcuseniua hingsleyoe, 

 Gthr., Myomyrus macrodon, Blgr., Gnathonemus petersii, 

 Gthr., and the following new Mormyrus. 



Mormyrus humhanus. 



Depth of body 4^ times in total length, length of head 

 4^ times. Head 1^ times as long as deep, with strongly 

 curved upper profile ; snout short, f postorbital part of head ; 

 teeth small, very feebly notched, 5 in upper jaw, 8 in lower ; 

 eye niodeiate, ^ length of snout, | interorbital width. Dorsal 

 62, originating above base of ventral, 8 times as far from 

 end of snout as from base of caudal, 2| times as long as anal. 

 Anal 25, oiiginating a little nearer head than base of caudal. 

 Pectoral obtusely pointed, | length of head. Caudal with 



