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EUWENZORI EXPEDITION REPORTS. 



4. MOLLUSCA. 



By E. A. Smith, I.S.O., F.Z.S. 



Eeceived October 24, read November 17, 1908. 



[Pl.ite I.*] 



The collection of Mollusca now reported on, although small, contains several 

 specimens of interest, besides the four species which appear to be new. The fine 

 series of Limicolaria saturata and L. smithi show how variable those species are both 

 in form and colour, and the variety of the large Achatina schweinfurthi presents a 

 very unusual style of coloration. 



As the Ruwenzori district had been to a certain extent explored by Dr. Stuhlmann f 

 in 1894, it is rather surprising that the present collection, consisting of only 

 fourteen species, should contain so large a proportion of novelties. 



A few new species obtained by the Duke of the Abruzzi on Ruwenzori have been 

 described by Carlo Pollonera J. 



1. ViTEiNA OLEOSA Martens. 



Vitrina oleosa Martens, Deutsch-Ost-Afrika, vol. iv. p. 40, pi. iii. fig. 4. 



a-n. Mubuku Valley, E. Ruwenzori, 10,000-14,000 feet. 



Several specimens from the above elevation apparently belong to this species, or to 

 Vitrina cagnii Pollonera §. From F. oleosa they may differ in having the peristome 

 of the same colour as the rest of the shell, and not black. V. cagnii is said to be 

 " fusco-cornea," whereas the present specimens are yellowish horn-colour. 



2. Tkochozonites leptaleus, sp. n. (Plate I. figs. 12, 13.) 



Testa concave conica, ad peripheriam acute carinata, tenuis, anguste perforata, 

 pallide cornea, supra baud nitida ; spira elata, breviter concava ; anfractus 8, lente 

 accrescentes, superiores 2|- globosi, Iseves, cseteri planiusculi, ad suturam carinati, 

 plicis tenuibus oblique arcuatis numerosis ornati, ultimus infra carinam acutem 

 nitens, planiusculus, lineis incrementi tenuissimis, striisque microscopicis 



* For explanation of the Plate, see p. 50. 



t For an account of Dr. Stuhlmann's collections, see Martens and Simroth in ' Deutsch-Ost-Afrika,' 

 vol. iv. (1898). 



X Boll. Mus. Zool. ed Anat. Torino, vol. ssi. no. 538 (1906). 

 § Tom. cit. p. 1 (1906). 



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