Fishes from the Lower Congo. 149 



between the gill-openings is two thirds of its length (to the 

 end of the occipital process) , its width between the eyes three 

 eighths. The nasal barbel extends to the gill-opening, the 

 maxillary and the outer mandibular to the end of the pectoral 

 spine. Pectoral very small, two fifths the length of the head ; 

 its spine strongly serrated on the inner edge, feebly on the 

 outer, two thirds the length of the fin. Ventrals very small, 

 in the anterior third of the total length. Uniform blackish 

 brown. 



Total length 260 millim. 



A transition-form between Clarias and GymnaUabes. 



Native name "Fouca." Lives in the lagunas and marshes of 

 the Lower Congo ; is often found in holes in the mud during 

 the dry season. The species reaches twice the size of the 

 type specimen (i^. Hens). 



Mormyrus {Petrocephalus) Sauvagii. 

 D. 29. A. 36. V. 6. L. lat. 40. 



Snout very short, elevated, one sixth the length of the head, 

 shorter than the diameter of the eye. Cleft of tlie mouth 

 below the vertical from the front margin of the eye, its width 

 two seventlis of the length of the head. Teeth comparatively 

 large, dilated and notched, forming a complete series round 

 the margin of both jaws. Diameter of the eye somewhat 

 more than one fifth of the length of the head, three fourths the 

 widtli of the interorbital space. The origin of the dorsal is 

 equally distant from the occiput and the root of the caudal. 

 The pectoral equals the distance between the eye and the gill- 

 opening and extends a little beyond the base of the ventral, 

 which is not quite one third as long as the head. The height 

 of the body is contained thrice in the total length (without 

 caudal), the length of the head thrice and two thirds. The 

 length of the caudal peduncle (from the extremity of the base 

 of the anal) equals three fifths the length of the head, or ' 

 two thirds the length of the dorsal. Plumbeous, without any 

 spots. 



Total'length 175 millim. 



Allied to M. hane, Lacdp., but easily distinguished by 

 the still shorter snout, the larger mouth, and the stronger 

 dentition. 



Native name " Tembe." Found in the creeks of the Lower 

 Congo and the tributary streams. 



Named in honour of my friend Dr. H. E. Sauvage, who 

 has added so much to our knowledge of the fishes of tropical 

 Africa. 



