94 SAIITH : ON SOME LAND SHELLS FROM BRITISH EAST AFRICA. 



circiter aequans, dentibus pluribus munita; peristoma albidum, leviter 

 incrassatum, expansum et reflexuin, margine externo tridentato, basali 

 dente unico parvo munito, columellari dente bifido, parietal! dente 

 lamelliforme superne labro fere juncto. 



Longit. loh millim., diam. 5.^, ; apertura cum perist. 4 longa, 2>h 

 lata. 



Of about the same size and general appearance as E. liannijujfoni, 

 Smith, hut somewhat broader, with a s([uarer aperture, a different 

 columellar tooth and different teeth within the outer lip. These are 

 three in number, the central being most prominent and the anterior 

 one the smallest. The spiral striation is only visible under a powerful 

 lens and is most observable upon the back of the body-whorl. 



Martensia permanens, n. sp. Figs. 2, 3. 



Testa depresse conoidalis, carinata, anguste perforata, supra pallide 

 fusca, infra albida ; spira breviter conica, ad apicem obtusa ; anfractus 

 6i lente accrescentes, duo superiores leviter convexi, microscopice 

 spiraliter striati, coeteri convexiusculi, ad suturam carinati, oblique 

 confertim et arcuatim costulato-striati, ultimus ad peripheriam acute 

 angulatus, vel carinatus, antice baud descendens, infra fere laevis, 

 lineisque tantum incrementi tenuibus sculptus ; apertura oblique 

 lunata ; peristoma tenue, margine columellari ad insertionem breviter 

 expatiso et reflexo. 



Diam. maj. 21 millim., min. iS| ; alt. 12. 



Figs. 2 and 3. — Martensia pcn/ianciis, n. sp. 



There is a distinct difference in the colour of the upper and lower 

 surfaces of this species. The former is of a pale brown tint varied 

 with pale hair like streaks in the direction of the lines of growth, 

 whilst the latter is (jf an uniform pale or whitish colovn-. The miiiute 

 spiral striation is limited to the protoconcli, consisting of about two 

 whorls. The keel or angulation of the l)odv-whorl in adult si)ecimens 

 is not very sharp, but in young cxami^les it is much more acute, as 

 may be seen by the distinct carina which marks the suture. 



