112 Dr. A. Giinther on new Fishes 



Butropius mandibularis, sp. n. 

 D. 1/6. A. 59. P. 1/10. 



The height of the body is contained thrice and three-fourths 

 in the total length (without caudal), the length of the head five 

 times. The greatest width of the head equals its length without 

 snout. The upper jaw is slightly the longer; cleft of the mouth 

 twice as broad as deep. Anterior niandibulary barbels short; 

 maxillary, nasal, and posterior niandibulary barbels subequal in 

 length, not extending to the base of the pectoral, but beyond 

 the orbit. The diameter of the eye is two-ninths of the length 

 of the head. The dorsal fin is situated entirely before the 

 ventral, the width of its base being more than that of the latter; 

 its height equals the length of the head ; spine slender, serrated 

 posteriorly. The anal fin terminates at some distance from the 

 caudal. Caudal deeply forked, with the lobes pointed. Pec- 

 toral spine rather broad, serrated, terminating at some distance 

 from the ventral, 



A single specimen, 9 inches long, was sent by Mr, Ussher 

 from the Bossumprah River to the Liverpool Museum. 



Chrysichthys macrops (Gthr.). 

 Upper Nile, Gaboon, Bossumprah River (Gold Coast). 



Synodontis guttatus (Gthr.). 

 Gaboon, Lake Aznigo. 



Malapterurus affinis (Gthr.). 

 Old Calabar, Gaboon. 



Nannocharax, g. n. {Characin.). 



Dorsal fin short, placed in the middle of the body, above the 

 ventrals ; anal short. Body elongate, covered with scales of 

 moderate size ; belly rounded. Cleft of the mouth very small, 

 similar to that of a Coregonus ; intermaxillary and mandible with 

 a single series of notched incisors. Nostrils close together. 

 Gill-openings rather narrow, the gill-membrane being grown to 

 the isthmus. 



This genus is the type of a separate group, Nannocharacina, 

 intermediate between Anostomatina and Tetragonopterina. 



Nannocharax fasciatus, sp. n. Plate IIL fig. A. 



D. 12. A. 10. V. 10. L, lat. 46, L. transv. 41/44. 



The height of the body is contained six times in the total 

 length (without caudal), the length of the head four times and 

 one-third. Eye large, the length of its diameter being less than 



