93 



T. suborbiculari, subdepressa, tenuiuscula,viridescenti-fusca, 

 fascia saturation lineaque albicante medianis ; spira brevissima 

 obtusa, anfractibus 4, lsevibus, transversim striatis : sutura 

 distincta ; apertura circulari, postice subacuminata, peritre- 

 mate tenui ; operculo crassiusculo, anfractibus 7- 



Shell nearly orbicular, rather depressed, and thin, of a 

 greenish brown, with a darker band, and a whitish circumferen- 

 tial line ; spire very short, obtuse, with four smooth trans- 

 versely striated volutions ; suture distinct ; aperture circular, 

 rather acuminated posteriorly, with a thin peritreme ; opercu- 

 lum thickish. From Yungas in Bolivia, D' Orbigny, 



7. C. orbella. (pi. xxiii. f. 6*, 6**) Lam. p. 148. 

 De Lessert Recueil pi. 29, f. 13. 



T. suborbiculari, subdiscoidea, tenui, apice obtuso, paululum 

 levato, submamillari ; anfractibus 4, superne spiraliter striatis, 

 striis prominentibus, infra leviter striatis ; umbilico patulo ; 

 apertura circulari, peritremate tenui, subreflexo. 



Shell nearly orbicular, almost discoid, thin and hyaline, 

 with a slightly elevated, obtuse, submamillary apex ; volutions 

 4, with prominent spiral striee on the posterior part, but with 

 very slight striae anteriorly ; umbilicus wide spreading ; aper- 

 ture circular with a thin and slightly reflected peritreme. In 

 Mr. Cuming's Collection ; locality unknown. 



8. C. stbamineum, (pi. xxix. f, 211, 212.) Reeve. 



T. suborbiculari, subdepressa, tenui, fulvescente, spira. obtu- 

 sa, anfractibus 4, rotundatis, postice prope suturam rugulosis, 

 deinde striis elevatis obliquis adumbilicum magnum decurren- 

 tibus ; apertura subelliptica, peritremate tenui, acuto, postice 

 paululum angulato, supra ultimum anfractum subinterrupta ; 

 operculo testaceo. anfractibus 7 > oblique striatis, sutura pro- 

 funda. 



Shell suborbicular, depressed, thin, pale yellow-brown; spire 

 obtuse ; volutions 4, rounded, rugulose at the posterior part 

 near the suture, and then with elevated oblique lines, running 

 into the umbilicus, which is very large ; aperture slightly 

 elliptical, peritreme thin, sharp edged, slightly angular, and in 

 a small degree interrupted at the last volution ; operculum 

 testaceous, with 7 obliquely striated volutions. From Merida 

 in the Columbian Andes. 



9. C. cingulatum (pi. xxix. f. 213, 214.) nob. 



T. suborbiculari, subdepressa, crassiuscula, albicante, epi- 

 dermide castaneo-fusca induta ; spira. brevi, obtusa, anfractibus 

 4, rotundatis, rugulosis, cingulo ad peripheriam levatiusculo, 



M 



