95 



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

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

 volutions, apex rather obtuse ; sviture 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 (lead 

 leaves, near Calaumay, Luyon, H. Cuming. 



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



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

 maculosa ; spira fere plana, anfractibus 4, subrotundatis ; 

 apertura fere 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 fiat, 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, intiis transversim striato ; operculo tes- 

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



Shell of a rather depressed or])icalar 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 

 1 )ng well known it does not appear to have been described or 

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



