| OCR Text |
Show 21 8 DR. A. GtrNTHER ON A COLLECTION OF [Feb. 4, whence I believe no specimens have been received previously. I distinguish the following eight species among them :- Polypterus bichir. Chromis niloticus. tristrami. Synodontis schal. Citharinus geoffroii. Alestes rueppellii. Distichodus rudolphi, sp. nov. Barbus, 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 Rudolf or on the return journey, in various localities which will be indicated under the head of the several species. 1. POLYPTERUS BICHIR, Geoffr. . Two young specimens from Lake Rudolf, both belonging to the variety with ten spines which also occurs in the Upper Nile and West Africa. 2. CHROMIS NILOTICUS, 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. ^. 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. yA. c. A young specimen from Lake Rudolf, 10 cm. long. D. jg, 3. CHROMIS TRISTRAMI, Gthr. Specimens from Lake Rudolf 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 Rudolf (12.8.95). D. ~ b. Another obtained in a dry watercourse, some 10 miles from Lake Rudolf (16.8.95), 15 cm. long. D. g. |
