Dr. A. Giinther on new Fishes from Angola. 143 



than the other barbels. The distance of the vent from the 

 end of the snout is two fifths of its distance from the root 

 of the caudal. The branchial accessory organ is dendritic. 

 Uniform brownish-black. 



Length 8£ inches. Interior of Ambriz. 



This very singular form differs so materially from the type, 

 described in the 'Annals ' for August 1867, that it may be 

 regarded at all events as a subgenus, for which the name 

 Channallabes may be used. In appearance the head and 

 body and the vertical fins resemble very much those of G. 

 typus ; but with the greater elongation of the body the paired 

 fins became useless and disappeared. The typical specimen 

 of G. typus has the postbranchial organ of a much more simple 

 form than G. opus ; but this is, perhaps, only due to age, as in 

 Anabas. 



Brycon^ethiops. 



This genus is the African representative of the American 

 Brycon, from which it is distinguished by its very small, 

 toothless maxillary. 



Dorsal fin placed in the middle of the length of the body, 

 opposite to the ventrals ; anal rather long. Body oblong, 

 covered with scales equal in size. Belly rounded. Cleft of 

 the mouth rather narrow. Intermaxillary with three series of 

 teeth, the teeth of the two outer series being subcorneal, those 

 of the inner broad, molarlike, with several cusps. Maxillary 

 small, short, enveloped in the skin, toothless. Mandible with 

 a series of strong tricuspid teeth, and with a pair of conical 

 teeth in the middle behind the front series. Gill-openings 

 wide, the gill-membranes being united for a short space in 

 front, but not attached to the isthmus. Gillrakers short, 

 feeble, slender, lanceolate. 



Bryconcethiops microstoma. 

 D. 10. A. 20. V. 9. L. lat. 37. L. transv. 6/5. 



The height of the body is one third of the total length 

 (without caudal), the length of the head two sevenths. The 

 large eye is covered with an adipose eyelid in front and 

 behind ; it is equal in length to the postorbital portion of the 

 head, and longer than the snout. The maxillary terminates 

 under the front margin of the eye. Dorsal fin nearly midway 

 between the extremity of the snout and the root of the caudal. 

 Ventral nearly opposite to the middle of the dorsal. Pectoral 

 not extending to the ventral. There are three series of scales 

 between the lateral line and the ventral. Silvery ; a bluish 



