243 



0. Cyclostoma unicolor, Pfr. C. testa umbilicaid, globoso. 

 conicd, solidd, longitudinaliter confertissime et regulariter striatd, 

 spiraliter confertim sulcatd, opacd,fulvido-stramined; spird conicd, 

 subtruncatd; anfractibus 6, convexiuscuUs , ultimo svperne et medio 

 acute carinato : carind tertid, validissimd, circa umbilicum angus- 

 tum, infundibuUformem, intus profundi spiraliter sulcatum ; aper- 

 turd parum obliqud, angulato-circulari ; peristomate simplice, 

 marginibus callo lunatim exciso junctis, dextro expansiusculo , 

 sinistro medio dilatato, patente. — Operculumi 



Diam. maj. 20, miu. 17, alt. 16 mill. 



/3. Majus, striis longitudinalibus obsoletioribus, albidum. 



Diam. maj. 28, min. 22, alt. 20 mill. 



Hab. ? 



6. Cyclostoma ponderosum, Pfr. C. testa late umbilicatd, 

 conoideo-depressd, crassd, ponderosd, subtiliter et oblique mal- 

 leato-rugulosd, olivaceo-fusculd ,• spird breviter conoided, obtusd ; 

 anfractibus 5, parum convexis, celeriter accrescentibus, ultimo lata, 

 subdepresso, ad peripheriam obtuse f uniculato-carinato ; aperturd 

 obliqud, angulato-ovali, intus albd, nitidd ; peristomate ct-asso, 

 recto, subcontinuo, superne angulato-dilatato, margine columellari 

 perarcuato. — Operculum membranaceum, pellucidum, fusculum, 

 arctispirum. 



Diam. maj. 36, min. 30, alt. 20 mill. 

 Hab. Guatemala. 



7. Cyclostoma Dysoni, Pfr. C. testd umbilicatd, conoideo- 

 orbiculatd, solidd, pliculis confertis undulatis, subconfluentibus 

 sculptd, fusco-olivaced, pallidius strigatd et ohsoleti fasciatd ; 

 spird conoided, obtusuld ; anfractibus A\, convexiuscuUs, celeriter 

 accrescentibus, ultimo rottindato; umbilico mediocri, conico; aper- 

 turd fere verticali, angulato-subcirculari, intus cterulescente, ni- 

 tidd; peristomate simplice, recto, superne angulato, breviter ad- 

 nato, margine dextro declivi, columellari subdilatato-patente. — 

 Operculum 1 



Diam. maj. 27, min. 22, alt. 16 mill. 

 Hab. Honduras (Mr. Dyson). 



8. Cyclostoma disculus, Pfr. C. testd umbilicatd, depressd, 

 discoided, solidiusculd , nitidd, alabastrind ; spird planissimd ; an- 

 fractibus vix 4, convexiuscuUs, ad suturam impressam striatis, 

 ultimo teretiusculo, subdepresso, in umbilico lata distinctius striata, 

 antice brevissime soluto ; aperturd subverticali, circulari; peri- 

 stomate continuo, simplice, recto. — Operculumi 



Diam. maj. 14, min. 11, alt, 5 mill. 

 Hah. ? 



9. Cyclostoma desciscens, Pfr. C. testd late umbilicatd, de- 

 presso-semiglobosd, superne confertim sulculatd, albidd; spird 

 convexd; anfractibus 4^, convexiuscuUs, ultimo terete, antice 

 subito deflexo, basi Icevigato ; aperturd feri horizontali, lunato- 



