144 Dr. A. Gunther on new Fishes from Angola. 



spot at a sliort distance behind the gill-opening is move 

 distinct after the scales are removed. Dorsal fin with a 

 blackish line behind and parallel to each of the rays. 

 Two specimens, 4-^ inches long, from the River Congo. 



Alestes holargyreus. 

 D. 10. A. 21. L. lat. 23. L. transv. 4i-/3. 



Allied to A. tceniuriis. 



The height of the body is a little more than one third of 

 the total length (without caudal), the length of the head two 

 sevenths. The origin of the dorsal fin is immediately behind 

 the base of the ventrals ; pectoral just reaching the ventral. 

 Bright silvery, without spots. Caudal with a very indistinct 

 blackish median band. 



Several specimens, 2^ inches long, from the River Congo. 



DisticJiodus affinis. 

 D. 16. A. 21. L. lat. 37. L. transv. 6^/9. • 



Allied to D. notospilus. 



The height of the body is two fifths of the total length 

 (without caudal), the length of the head a little less than two 

 sevenths. Nose scarcely protruding. Teeth in a double series, 

 the lower jaw with fourteen teeth in the front series. Body 

 uniform greenish, without spot. The membrane between the 

 anterior three or four dorsal rays black. 



A young specimen, only 2 inches long, from the River 

 Congo. 



Mormyrus Monteiri. 

 D. 30. A. 38. L. lat. 74. 



Allied to M. Petersii and M. senegalensis. 



Snout subconical, nearly straight, of moderate length, with 

 a mandibular fleshy appendage in front, which is about as 

 long as the eye. Eye of moderate size, situated before the 

 middle of the length of the head, and one half of the length of 

 the snout (without appendage). Pectorals extending beyond 

 the middle of the length of the ventrals. The height of the 

 body is two sevenths of the total length (without caudal), the 

 length of the head two ninths. The free 'portion of the tail as 

 long as the head {loithout appendage). Coloration uniform, 

 shining silvery. 



Three specimens from Angola, the largest being 8^ inches 

 Ions:. 



