243 
5. CycLostomMa uNicoLor, Pfr. C. testd umbilicatd, globoso- 
conicd, solidd, longitudinaliter confertissime et regulariter striatd, 
spiraliter confertim sulcatd, opacd, fulvido-stramined; spird conicd, 
subtruncatd ; anfractibus 6, conveviusculis, ultimo supern? et medio 
acute carinato: carind tertid, validissimd, circa umbilicum angus- 
tum, infundibuliformem, intus profunde spiraliter sulcatum ; aper- 
turd parum obliqud, angulato-circulari; peristomate simplice, 
marginibus callo lunatim exciso junctis, dextro expansiusculo, 
sinistro medio dilatato, patente.—Operculum? 
Diam. maj. 20, min. 17, alt. 16 mill. 
B. Majus, striis longitudinalibus obsoletioribus, albidum. 
Diam. maj. 28, min. 22, alt. 20 mill. 
Hab. 2 
6. CycLostoMA ponpDEROsUM, Pfr. C. testd lat? umbilicatd, 
conoideo-depressd, crassd, ponderosd, subtiliter et oblique mal- 
leato-rugulosd, olivaceo-fusculd ; spird breviter conoided, obtusd ; 
anfractibus 5, parum convezis, celeriter accrescentibus, ultimo lato, 
subdepresso, ad peripheriam obtuse funiculato-carinato ; apertura 
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. Cyctostroma Dysoni, Pfr. C. testd umbilicatd, conoideo- 
orbiculatd, solidd, pliculis confertis undulatis, subconfluentibus 
sculptd, fusco-olivaced, pallidius strigatd et obsolete fasciatd ; 
spird conoided, obtusuld ; anfractibus 44, conveviusculis, celeriter 
accrescentibus, ultimo rotundato; umbilico mediocri, conico; aper- 
turd fere verticali, angulato-subcirculari, intus c@rulescente, ni- 
tidd ; peristomate simplice, 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 piscutus, Pfr. C. testd umbilicatd, depressd, 
discoided, solidiusculd, nitidd, alabastrind ; spird planissimd ; an- 
Sractibus vir 4, conveviusculis, ad suturam impressam striatis, 
ultimo teretiusculo, subdepresso, in umbilico lato distinctius striato, 
antice brevissimé soluto; aperturd subverticali, circulari ; peri- 
stomate continuo, simplice, recto.—Operculum? 
Diam. maj. 14, min. 11, alt. 5 mill. 
Hab. 2 
9. CycLostoma pEsciscens, Pfr. C. testd late umbilicatd, de- 
presso-semiglobosd, superné confertim sulculatd, albidd; spird 
convexd ; anfractibus 44, convexiusculis, ultimo terete, antic® 
subito deflexo, basi levigato ; apertura fere horizontali, lunato- 
