163 



A LIST OF THE LAND AND FKESH-WATER MOLLUSCA COLLECTED 

 BY DR. J. W. GREGORY IN EAST AFRICA DURING HIS EX- 

 PEDITION TO MOUNT KENIA, WITH DESCRIPTIONS OF A FEW 

 NEW SPECIES. 



By Edgak a. Smith, F.Z.S., etc. 



Head June Sth, 1894. 



The collection of land and fresh-water Mollusca obtained by Dr. 

 Gregory, altliough comparatively small, contains a few new and other 

 interesting species. J3r. Hildebrandt, the German traveller, who 

 previously visited the Ukamba country, also brought home zoological 

 collections, and consequently in a certain measure forestalled the 

 results of Dr. Gregory's efforts. Dr. Hildebrandt's collections were 

 enumerated and described by Prof. E. von Martens in the Monatsb. 

 Akad. Wissen. Berlin, 1878, pp. 288-298. 



1. Dendrolimax, sp. 



JIab. — Papyrus swamp, north of Rangatan Ndari. 



A single specimen only Avas obtained. It is about 60 mm. in 

 length, of a dirty grey buff colour, mottled with black along the 

 sides of the body and upon the shield. The dorsal keel is wavy 

 through contraction in alcohol, and is somewhat caudate above the 

 enormous terminal pore. The shell is ovate, thickened at the 

 terminal exposed nucleus, and has a length of 11 mm., and is 8 mm. 

 in width. 



2. ViTRTNA Baeistgoensis, h sp. Figs. 2 and 3. 



Testa depressa, pellucida, nitida, virenti cornea, lineis incrementi 

 sculpta ; spira planiuscula, apice parum elato ; anfractus vix tres, 

 rapide crescentes, convexiusculi, ad suturam concave marginati, 

 ultimus magnus ; apertura rotunde lunata, magna; peristoma undique 

 tenue. Diam. maj. IT?, min. 9 mm. ; alt. 7 mm ; apertura 6-7 alta, 

 8 mm lata. 



ITab. — Baringo and lower forest zone, Kenia. 



The discrimination of species of this genus is in many cases 

 extremely difficult, owing to the fact that, with the exception of 

 slight variations in form, the shells present scarcely any \ery decided 

 characters. 



The present species^ very closely resembles V. iorhonica, Morelet, 

 in form, but may be separable on account of a somewhat different 

 nucleus and more marked lines of growth, which, here and there, are 

 almost sub plicate. 



* Temporarily placed in Vitrina ; possibly when the animal is known it will prove 

 to belong to Africarion or some other allied group. 



