251 CIIAEACINID^. 



interorbital width ; mouth extending to below anterior border of eye ; 

 about 30-34 teeth on each side in each jaw. Gill-rakers very short. 

 Dorsal III 10-12, originating at equal distance from end of snout and 

 from caudal, longest ray f length of head. Anal III 8-9. Pectoral 

 shorter than ventral, half length of head. Caudal forked, with pointed 

 lobes, half covered with scales. Caudal peduncle 2 to 2^ times as long 

 as deep. Scales 70-80 j^^, 6 or 7 between lateral line and root of 

 ventral. Silvery, brownish on the back ; a blackish spot at the tip of 

 the dorsal fin and one or two on each caudal lobe. 



Total length 97 millim. 



Ogowe River. — Type, in Paris Museum, examined. 

 1- Hgr. Ngomo. Rev. E. Hang (C.) ; 



Paris Museum (E.). 



14. NANN^ffiTHIOPS. 

 Giinlh. Proc. Zool. Soc. 1871, p. 669 ; Bouleng. Poiss. Bass. Congo, p. 182 (1901), 

 and Fish. Nile, p. 137 (1907). 



Mouth rather small, each jaw with two series of small, notched, 

 bicuspid teeth ; a few small teeth at the base of the maxillary bone. 

 Cheek covered by the suborbitals; nostrils close together, separated by 

 a valvular flap ; gill-membranes free from the isthmus. Body moderately 

 elongate, strongly compressed; belly rounded. Scales rather large, 

 with strongly ciliated border ; lateral line, if distinct, equally distant 

 from the dorsal and the ventral outline ; a scaly process at the base of 

 the ventral. Dorsal fin with 13 to 15 rays, above the ventrals ; anal 

 fin with 10 rays; a very small adipose dorsal fin. Vertebrae 33 

 (20-fl3). 



Tropical Africa. 



1. NANNiETHIOPS UNIT^ENIATUS. 

 Gunth. Proc. Zool. Soc. 1871, p. 670, pi. Ixv. fig. C ; Sauv, Bull. Soc. Zool. 

 France, 1882, p. 321 ; Vaill. Bull. Soc. Philom. (8) v. 1893, p. 13 ; Bouleng. 

 Poiss. Bass. Congo, p. 182 (1901) ; Lonnb. Ann. & Mag. N. H. (7) xii. 1903, 

 p. 38 ; Werner, Sitzb. Ak. Wien, cxv. i. 1906, p. 1129 ; Bouleng. Fish. Nile, 

 p. 137, pi. xxi. fig. 3 (1907). 



Depth of body 2| to 3^ times in total length, length of head 3| to 4 

 times. Head about twice as long as broad, a little longer than deep, its 

 upper surface rugose in the adult; snout rounded, shorter than eye, 



