139 



spiraliter substriatis, ultimo fulvo-unifasciato, antice laevi ; 

 sutura profunda ; apertura rotundata ; peritremate tenui, sub- 

 reflexo ; umbilico mediocri. 



Shell globoso-pyramidal, thin, nearly white, dull; spire 

 rather acuminated, but with an obtuse apex ; volutions 5 — 6, 

 rounded, slightly spirally striated posteriorly ; the last volution 

 with a single fulvous band and smooth in front ; suture deep ; 

 aperture round, peritreme thin, very slightly reflected ; um- 

 bilicus middling. Africa; Mr. Gray. 



135. C. gibbum, (pi. xxx. f. 247. 248.) Fer. Mag. de 

 Zool. pi. 117- f, L. 



T. suborbiculari, subpyramidali, tenui, subdistorta, cineras- 

 cente, spira mediocri, obtusa, apice rufescente, anfractibus 

 quinque rotundatis, transversim striatis, ultimi dorso inflato, 

 demum coarctato et quasi strangulato ; apertura circulari, 

 margine duplicato, umbilicum versus subsinuato, peritremate 

 latiusculo, refiexo, acuto, umbilicum versus angustiori ; um- 

 bilico mediocri. 



Shell nearly orbicular, somewhat pyramidal, rather thin, 

 and having a distorted appearance, ash-coloured ; spire of 

 moderate length, blunt, with a dull red apex, consisting of 

 five rounded, transversely striated volutions, the dorsal por- 

 tion of the last volution inflated, and then suddenly contracted, 

 as if strangled; aperture circular, having a double margin, 

 and slightly sinuated on the side toward the umbilicus, with a 

 rather broad, sharp-edged, reflected peritreme, narrower toward 

 the umbilicus, which is of moderate dimensions. Operculum 

 circular, horny, exactly closing the contracted part or throat 

 of the aperture. 



From the grottos of Touranne, in Cochin-China. 

 136. C. Pretrei, (pi. xxxi. f. 260.) VOrb. 



T. globoso-pyramidali, tenui, scabra, alba, spira. acuminata, 

 apice decollato, fusco ; anfractibus 4, rotundatis, transversim 

 striatis et costatis, costis minutis, subdistantibus, muricatis, 

 ultimo prope aperturam disjuncto : sutura profunda ; aper- 

 tura circulari, peritremate duplici, interno simplici, externo 

 angusto, reflexo, undulato ; umbilico magno, spiraliter cos- 

 tato. 



Shell globosely-pyramidal, thin, white, rough ; spire acumi- 

 nated, its apex decollated, brown ; volutions four, rounded, 

 transversely striated and ribbed; ribs small, distant, muricated; 

 the last volution disjoined near the aperture ; suture deep ; 

 aperture circular, peritreme double, inner simple, outer nar- 



