E. A. SMITH— MOLLUSC A. 47 



The surface of this shell is highly glossy, although exhibiting spiral strise and lines 

 of growth. The latter, under the lens, have a somewhat puckered appearance below 

 the suture. 



11. HoMORUS RUNSSOEiNus (Martens). 



Glessula runssorina Martens, Deutsch-Ost-Afrika, vol. iv. p. 114, pi. v. figs. 11, 12. 

 a-G. Mubuku Valley, E. Ruwenzori, 10,000 feet. 



Three specimens, two of which are larger than the shells described by von Martens. 

 Length 32 mm., diam, 11 ; aperture 12 mm. long, 6 broad. 



The upper whorls exhibit more or less indistinct spiral strise, and the whole surface 

 under the microscope presents a minutely frosted appearance. 



12. Ctclophoeus (Aferulus) elatior Martens. 



Cyclophorus elatior Martens, Deutsch-Ost-Afrika, vol. iv. p. 8, pi. i. fig. 1, pi. ii. fig. 4. 



a-c. Mubuku Valley, E. Euwenzori, 5000-7000 feet. 



This species is remarkable for the spiral brown lineation of the yellowish peri- 

 ostracum. When this is worn off the shell is dirty white beneath. Von Martens's 

 specimens were collected by Dr. Stuhlmann near the south shore of Lake Edward. 



13. LiMN^A NATALENSis Krauss. 



LimiiiBus natalensis Krauss, Siidafrik. Moll. p. 85_, pi. v. fig. 15. 



a, h. Ruwenzori (no special locality given). 



This South African species appears to have a wide range northward, if the various 

 shells which have been recorded under this name all belong to one and the same 

 species. It is said to occur in Lakes Nyassa and Tanganyika. 



14. Planorbis beidouxianus Bourguignat. 



Planorbis bridouxianus Bourg. Ann. Sci. Nat. 1890, vol. x. p. 20, pi. i. figs. 9-12. 

 «, b. Euwenzori (no special locality given). 



Two specimens, which seem to agree with the description and figures of this 

 Tanganyika species. 



