95 



Shell nearly globose, thin, with a dull reddish brown sur- 

 face, spire rather short, with 4 rounded, rapidly increasing 

 volutions, apex rather obtuse ; suture distinct ; aperture large, 

 circular, with a thin peritreme ; umbilicus small ; operculum 

 multispiral, whitish externally with a depressed central spot, 

 inside shining, with a channeled border. Found under dead 

 leaves, near Calaumay, Lucon, H. Cuming. 



13. C. stenostoma (pi. xxxi. f. 261.) nob. 



T. suborbiculari, depressa, crassa, laevi, castanea, albido- 

 maculosa ; spira fere plana, anfractibus 4, subrotundatis ; 

 aperturafere circulari, postice subangulata,paululum coarctata, 

 peritremate subincrassato, umbilico maximo ; operculo corneo, 

 anfractibus sex. 



Shell suborbicular, depressed, thick, smooth, chestnut 

 coloured with whitish specks ; spire nearly flat, volutions 4, 

 somewhat rounded ; aperture nearly circular, angular posteri- 

 orly, slightly contracted ; peritreme a little thickened ; um- 

 bilicus very large ; operculum horny, with six volutions. 

 From Arabia, communicated by Mr. Powis. 



14. C. corrugatum (pi. xxiii. f. 10, 11.) nob. 



T. orbiculato-subdepressa, crassiuscula, albida, apice ru- 

 fescente, epidermide tenui fusca induta; spira subpromi- 

 nula, acuminatiuscula ; anfractibus 5, rotundatis, trans- 

 versim striatis et corrugatis ; sutura distincta ; apertura 

 circulari, subeffusa, superne angulata, et in canalem incon- 

 spicuam desinente ; peritremate tenuiusculo, margine acu- 

 tiusculo, latere umbilicali incrassato ; umbilico magno, 

 margine crenulato, intus transversirn striato ; operculo tes- 

 taceo, extus lamina elevata convoluta, intiis corneo, polito. 



Shell of a rather depressed orbicular form, thickish, and 

 of a dirty white colour, with a reddish apex, and covered with 

 a thin fuscous epidermis, spire rather prominent and slightly 

 acuminated, volutions 5, rounded, transversely striated and 

 corrugated ; suture distinct, but not deeply marked ; aper- 

 ture circular, rather spreading, angular, and forming an 

 inconspicuous canal at the upper part, where it is joined to 

 the last volution ; peritreme thin, its outer margin sharpish, 

 its umbilical edge thickened ; umbilicus large, transversely 

 striated within, its edge crenulated ; operculum shelly, with a 

 raised convoluted lamina on the outer side, shining and 

 horny in appearance within. Although this species has been 

 long well known it does not appear to have been described or 

 figured by any author. It has been taken for the C. rugosa 



