218 DB. A. GtJNTHBE OTf A COltEOTION OF [Feb. 4, 



whence I believe no specimens have been received previously. I 

 distinguish the following eight species among them : — 



Polypterus bichir. 

 Chromis nilotieus. 



tristrami. 



Synodontis schal. 

 Oiiharinus geoffroii. 

 Alestes rueppellii, 

 Distichodus rudolphi, sp. nov. 

 Barhus, sp. 



It is a noteworthy fact that five of these species belong to the 

 fauna of the Nile, although they are by no means limited to that 

 river, having been found in various other parts of Tropical Africa. 

 Chromis tristrami (or Acerina zillii, Gerv.) has been described from 

 fresh and saline waters of the oases of the Sahara ; and Distichodus 

 rudolphi is closely allied to the Nilotic D. rostratus. The other 

 species enumerated in the following list were obtained en route to 

 Lake Eudolf or on the return journey, in various localities which 

 will be indicated under the head of the several species. 



1. POLYPTEEUS BICHIE, Geoffr. . 



Two young specimens from Lake Itudolf, both belonging to the 

 variety with ten spines Avhicli also occurs in the Upper Nile and 

 West Africa. 



2. Cheomis NiiiOTicus, Hasselq. 



Of this widely distributed species, the Bolti of the Nile, three 

 specimens were in the collection. 



a. One from Lake Abeia, 24 cm. long ; its scales are somewhat 

 fewer in number than in typical specimens, viz. 27 along the 

 lateral line. D. j^. 



b. One from Lake Stephanie, 16 cm. long. The teeth of this 

 specimen are equally small, as in the preceding specimen, but fewer 

 in number, possibly owing to its younger age and less advanced 

 growth of the jaws. D- f|. 



c. A young specimen from Lake Eudolf, 10 cm. long. D. jg. 



3. Cheomis teisteami, Gthr. 



Specimens from Lake Eudolf cannot be distinguished from the 

 types which were obtained in, the oases of the Eastern Sahara. 

 The teeth of this species are much broader and larger than those 

 of the preceding species. 



a. A rather large specimen, but with the hinder part of the 

 body decomposed, from Lake Eudolf (12.8.95). D. !|. 



6. Another obtained in a dry watercourse, some 10 mUes from 

 Lake Eudolf (16,8.95), 15 cm. long. D. ji. 



