March 14, 1843. 
Wilham Yarrell, Esq., Vice-President, in the Chair. 
A paper by Mr. G. B. Sowerby was read, containing the following 
descriptions of new species of Shells belonging to the genus Cyclo- 
stoma. ‘The species described are chiefly from the collection of H. 
Cuming, Esq. 
Cycnostoma suTurats. Cyel. testd orbiculato-depressd, tenut ; 
epidermide olivaced indutd ; anfractibus 3-4 rotundatis, trans- 
versim tenuissim? striatis ; aperturd circulart, superné emargina- 
tione obsoletd ; peritremate tenui, margine acutiusculo ; umbilico 
patulo ; operculo concinne spirali. 
Hab. in umbrosis Demerare. 
A few specimens of this species were received many years ago by 
G. C. Bainbridge, Esq., of Liverpool. 
Cycrostoma rucuLosum. Cyel. testa orbiculato-subdepressd, tenut, 
translucidd ; anfractibus 4-5 rotundatis,rugulosis ; suturd distinctd ; 
aperturd rotundatd, supern® acuminatiusculd ; peritremate tenui, 
margine acutiusculo ; umbilico magno. 
Hab. in Jamaica. 
Found among the shells in the collection of the late G. Humphrey. 
Cycrosroma semistriatum. Cycl. testd orbiculato-subdepressd, 
tenvi, albidd, fasciis pallid? fuscis interruptis ; spird subprominuld, 
apice obtusiusculo ; anfractibus 4—5 rotundatis, superne longitudi- 
naliter striatis, infra levibus ; suturd distinctd ; aperturd circulari, 
superne subacuminata ; peritremate obsoletissime subreflexo, tenui, 
margine acutiusculo ; umbilico magno ; operculo sulco externo spi- 
rali, anfractibus 4-5. 
Hab. in India Orientali, in regione Poonah dicta. 
Cychosroma TransLucipum. Cycl. testa subglobosd, subpellucidd, 
albd ; epidermide corneo-indutd ; spird breviusculd, obtusa; anfrac- 
tibus quatuor rotundatis, prope suturam elevatiusculis, striatis, 
superne rugulosis ; aperturd subcirculari, superné subacuminatd ; 
peritremate acuto ; umbilico mediocri ; operculo testaceo, tenuius- 
culo, anfractibus septem, striatis. 
Cycrostoma Brasiuiense. Cycl. testd orbiculato-subdepressa, tenui, 
albd, opacd ; anfractibus 4-5 rotundatis, transversim striatis ; 
suturd profundiusculd ; apertura circulari; peritremate tenui, 
acuto ; umbilico magno ; operculo testaceo, duplicato, exttis tenuis- 
sim? spiral. 
Hab. in umbrosis propé Rio Janeiro, Brasiliz. 
Nos. CXXII. & CXXIII.—Proceepines or tuE Zoot. Soc. 
