gi^ Zoological Society. 



turn, infundihuliformem, intus pi-ofunde spiraliter sulcatum ; aper- 

 turd parum obliqud, angulato-circulari ; peristomate siniplice, 

 marginibus callo lunatlm excise junctis, dextro expansiusculo , 

 sinistra medio dilatato, patente. — Operculumi 



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



/3. Majus, striis longiludinalibus obsoletioribus, albidum. 



Diam. maj. 28, miu. 22, alt. 20 mill. ,; 



Hab. ? V 



6. Cyclostoma ponderosum, Pfr. C. testd late vmbilicatd, 

 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 funiculato-carinato ; aperturd 

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

 recto, subcontinuo, superne angulato- dilatato, margine columellari 

 perarcuato. — Operculum membranaceum, pellucidum, fusculum, 

 arctispirum. 



Diam. maj. 3G, min. 30, alt. 20 mill. 

 Hab. Guatemala. 



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

 orbiculatd, solidd, pUculis confertis undulatis, subconjluentibus 

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

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

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

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

 tidd; peristomate siniplice, recto, superne angulato, breviter ad' 

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

 Operculum ? 



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

 Hab. Honduras (Mr. Dyson). 



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

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

 fractibus vix 4, convexiusculis, ad suturam impressam striatis, 

 ultimo teretiusculo, subdepresso, in umbilico lato distinctius striato, 

 antice brevissime soluto ; apeiturd subverticali, circulari; peri- 

 stomate continue, simplice, recto. — Operculum 1 



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\, convexiusculis, ultimo terete, antice 

 suhito deflexo, basi lavigato ; aperturd fere horizontali, lunaio- 

 rotundatd, intus albd ; peristomate incrassato, marginibus remotis, 

 callo Junctis, basali reflexo, columellari subito arcuatim ascendente. 

 — Operculum 1 



Diam. maj. 10, min. 8|, alt. 5^ mill. 

 . ^ab. Socotra. 



