38 SMITH : NEW LAM) SHELLS FROM SOCOTRA. 



10. Lithidion bentii, n. sp. (PI. Y., figs, g-gh.) 

 Testa discoidca, apertissime vmhilicata, acute carinata alba, vel 

 supra pallide riifesccns, Icvitcr nitcns ; spira plana ; anfractits quinqne, 

 apicales duo {protoconcha) lacves, perconvexi, cactevi liris qitatuov 

 spiralibus gracilibus supra instructi, convcxinsculi, hie illtc radiatim 

 subplicaii, ultimus ad peripheriam carina compressa acute ornatns, infra 

 liris conccntricis 4-5 circumdatus ; aperlura rotuiidata, intus rufescens ; 

 peristoma album, marginibus callojunctis, margine snpero sursuni dilatafo, 

 infer lore incrassato, vix reflexo. 



Diam. maj. 13, min. 11, alt. 3 mm. 



Much flatter than L. maimorosum G. -Austen, with a much 

 more piominent peripheral keel. 



EXI'LANATION OF THE FIGURES ON PLATE V. 



Fig. I. Ennea cylindracca. 



Fig. 2. BuUminus (Passamaiella) mirabilis. 



Fig. 3. BuUminus (Passamaiella) bentii. 



Fig. 4. BuUminus (Passamaiella) rotundus. 



Fig. 5. BuUminus (Ovella) acutus. 



Fig. 6. BuUminus (Ovella) innocens. 



Fig. 7. Stenogvra insculpta. 



Fig. 8. Auricula socotrensis. 



Fig. 8a. Auricula socotrensis. Aperture enlarged. 



Fig. 9-9^. Lithidion bentii. 



