454 Zoological Society. 



turn, in/undibuliformem, intusprofundt spiraliter sulcatum; uper- 

 turd parum obliqud, angulato-circulari ; peristomate simplice, 

 marginibus callo lunatlm excise junctis, dextro expansiusculo, 

 sinistra medio dil at at o, patent e. — Operculum 1 



Diam. maj. 20, min. 17, alt. IG mill. 



/3. Majus, striis longitudinalibus obsoletioribus , albidum. 



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



Hab. ? 



6. Cyci.ostoma ponderosum, Pfr. C. tcsld late umbilicatd, 

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

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

 anfractibus 5, parum convcxis, celeriter accrescentibus, ultimo lato, 

 subdepresso, ad i^eripheriam obtuse funiculato-carinato ; aperturd 

 obliqud, angulato-ovali, intus albd, nitidd ; peristomate crasso, 

 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- 

 orbiculaid, solidd, jjUcuUs confertis undulatis, subconfluentibus 

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

 spird conoided, obtusuld ; anfractibus 4.\, convexiusculis, celeriter 

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

 turd fere verticali, anguluto-subcirculari, intus carulesccnte, ni- 

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

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

 Operculum 1 



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

 Hab. Honduras (Mr. Dyson). 



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

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

 fractibus vix 4, convexiusculis, ad suturam impressam striatis, 



ultimo teretiusculo, subdepresso, in umbilico lato distinctius striato, 

 antice brevissime soluto ; aperturd subverticali, circulari ; peri- 

 stomate continuo, simplice, recto. — Operculum ? 



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



llab. ? 



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

 presso-semiglobosd, superne confertim sulculatd, albidd; spird 

 convexd ; anfractibus A\, convexiusculis, ultimo terete, antice 

 subito defiexo, basi Icevigato ; ajyerturd feri horizontali, lunato- 

 rotundatd, intus albd ; peristomate incrassato, marginibus remotis, 

 callo Junctis, basali reflexo, columellari subito arcuatim ascendente. 

 — Operculum ? 



Diam. maj. 10, min. 8|, alt. b\ mill. 

 Hab. Socotra. 



