SMITH : NEW SPECIES OF LAND SHELLS FROM CENTRAL AFRICA. 317 



The last four whorls constituting the greater part of the shell are 

 about equal in width. 



6. Pyramidula (Gonyodiscus) ugandana. (PL IV., fig. 13). 



Testa tniniita, orbicularis^ late el perspective unibilicata, dilute fuscescens ; 

 spira depressa, supra anfr. ultimum paruvi elata ; aiifractus 4^7, 

 convexi, sutura profimda sejujicti, striis iticremente tenuissimis cou- 

 fertis sculpt i, ultinius haud desceudens; apertura oblique lunata ; 

 peristoma tenue, extremitatibus remotis, et margine colwnellari leviter 

 expa/iso. Diam. 2 ;/////., alt. i ;;////. 

 JIab., E. Uganda. 

 Nicely cleaned specimens have a somewhat silky appearance. 



7. Pyramidula (Gonyodiscus) imitata. (PI. IV., fig. 14). 



Testa P. tigandancB similis, sed minus depressa., angustius Jiuibilicata, 

 lineisque incrementi majus remotis obliquis arcuatis ornata; anfractus 

 quatuor, convexi, sutura profunda discreti; apertura oblique hmata ; 

 peristoma tenue, simplex, margi?ie columellari vix expnuso. Diam. 

 2 "5 mj/L, alt. I '3 jnm. 

 Hab., E. Uganda. 



A minute discoid shell resembling P. ugandana in colour and 

 general appearance. It is, however, although consisting of the same 

 number of whorls, noticeably larger when placed side by side. It is 

 also more narrowly umbilicated, and the growth-lines are quite 

 different, being decidedly more distinct and more distant. 



8. Pyramidula (Gonyodiscus) lamellifera. (PI. IV., fig. 15). 



Testa depressa, discoidea, subaperte umbilicata, fuscescens, striis incre- 

 7/ienti te/iuibus confertis, lamellisque 7-euiotioribus conspicuis ornata) 

 spira depressa, in medio vix elata; anfractus 3^-, convexi, sutura 

 profunda sejuncti, primus Icevis, pellucidus ; apertura fere circularis ; 

 peristoma tenue, margine columellari vix expanso. Diam. 275 mm., 

 alt. I '3 mtn. 

 Hab., E. Uganda. 

 This species is a little flatter above than P. imitata, more openly 



umbilicated, and at once distinguished by the lamellae, which, starting 



at the suture, pass obliquely across the body-whorl, but become 



obsolete as they pass into the umbilicus. 



9. Martensia percivali. (PI. IV., fig. 16). 



Testa depresse conoidea, a?iguste umbilicata, solidiuscula, albida, cretacea, 

 ad apiceni rufescens, haud nitida, ificrernenti lineis oblique arcuatis 

 confertis subregularibus sculpta ; spira breviter conoidea, ad apicem 

 faulo obtusa; anfractus 6-^-, lente accrescentes, sutura subprofunda 

 sejuncti, superiores duo Iceves, rufescentes, cceteri albidi vel interdum 

 dilute fusco strigati, ultimus aiitice vix descendens, primo supra 

 aperturam obsolete angulatus, angulo antice evanescente ; apertura 

 oblique lunata, intiis rufofusca; peristoma tenue, intus albo margina- 



