1893.] SHELLS l^EOM BKITISH OBJS^tflAL AFRICA, 633 



tution has been indebted on pre\aous occasions foj valuable collec- 

 tions from the Caineroous and the neighbourhood of Mount Kilima- 

 njaro. 



The most interesting specimens of the present collection ai'e 

 those obtained at Lake Mweru, a locality from which no Mollusca 

 have as yet been recorded. This lake lies to the south-west of 

 Lake Tanganyika, Mith which, however, it has no connection, as 

 would be presumed by the difference of the MoUuscan faunas so 

 far as they are at present- known. All the species from Lake 

 Mweru are undescribed with one exception, and this appears to be 

 a dead worn example of Lanistes ovum. The other species in- 

 clude two forms of Vivijjarus, t\\-o Chojiatra?, three Mekmice, a 

 very remarkable winged 11)1(0, and examples of two or three other 

 species of that genus, but represented by specimens too young or 

 too worn to be determined. 



Porms of aU these genera occur in Tanganyika, and one of the 

 species belongs to that group of Viviparus which, characterized 

 by the aperture beiug somewhat effuse anteriorly and the outer 

 lip sinuated, was described by the writer in these 'Proceedings' 

 for 1880 as a new genus from Tanganyika, under the name of 

 Neotliauma. 



1. Ennea johnstoni. (Plate LIX. fig. 1.) 



Testa elongata, cylindracea, cnissiuscida, rimata, Jiavo-viridis, 



jiarum nitida ; anfractus 6, convexmscidi, oblique fortiter striati, 



superiores quatuor regulariter crescentes, idtimus et penidtinms 



lonrje majores, idtimus elongatus, supra aperturam Icevior et sub- 



complanatus, pi-imo peroblique descendens, sed ad labrum breviter 



ascendeiis ; spira obtusissima ; sutura mediocriter profunda; 



apertura subovata, intus sordide albida, lonr/it. totius ^ paulo 



superans, denticulo unico parietali munita ; peristoma album,, 



incrassatum, anguste rejiexum, marginibus callo crassiuscido 



junctis. 



Longit, 20 millim., diam. 10 ; apertura 8 longa, 5| lata. 



Hab. Fort Johnston, Upper Shire Eiver {A. Wlujte). 



This interesting shell is quite unlike any other known species, 



but recalls the form o£ some of the Mauritian Goaospirce, e. g. 



G. modiolus, Perussac, althougli the relative proportion of the wiiorls 



is quite different. The oblique striic are distinct and thread-lilve, 



but less observable upon the body- whorl above the a])erture, where 



the surface has a faiutly flattened appearance. With this species 



I have associated the name of II. H. Johnston, Esq., the spirited 



Commissioner of this Country in British Central Africa, and the 



donor to the Museum of the specimens. 



2. Ennba kaeongana. (Plate LIX. fig. 2.) 



Testa cijlindracea, rimata, alba, nitida ; anfractus 7, hnie accres' 

 rentes, Icei'es, Uviter coui'c.viuscali, sutura profunda vix obliqua 

 scjuacti ; spira cglindnca, ad apicem obtuse conica ; anfr. ul- 

 timus antice hand dcsceivhns vel ascendents, pone labrum prof undo 



V.i* 



