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7. DESCRIPTION OF A NEW SPECIES OF CYTHEREA. 
By Lovett Reeve, F.L.S., F.Z.S. ere. 
CyTHEREA NoBILIs. Cyth. testd orbiculari-cordatd, crassd, trans- 
versim concentrice liratd, liris rudibus, obtusis, subplanulatis, 
numerosis, crebris, valde irregularibus, hic illic intermissis, non 
parallelis ; lacted, epidermide tenui corned, translucidd, indutd. 
Long. 41 in.; lat. 2} in.; alt. 4 in. 
Hab. q 
This fine species, from the collection of A. L. Gubba, Esq., is di- 
stinguished by a peculiarity in the form and arrangement of the con- 
centric ribs with which it is sculptured. They are very numerous, 
flattened, close-set, and extremely irregular, now narrow, now broad, 
each one varying irregularly in width and now and then suddenly in- 
termitted. It is of a pure cream-colour, covered with a thin, horny, 
transparent epidermis. Mr. Gubba obtained it from a vessel in 
Havre-de-grace, but could not ascertain its locality. 
8. DESCRIPTIONS OF TWENTY-FOUR NEW SPECIES OF HELICEA, 
FROM THE COLLECTION or H. Cumine, Esa. 
By Dr. L. Preirrer. 
1, Srrepraxis GLABRA, Pfr. Str. testd umbilicatd, depressé 
ovatd, tenui, pellucidd, virescenti-albidd, omnino glabrd ; spird 
laterali, acutiusculd ; suturd albo-marginatd ; anfractibus 6 
convexiusculis, penultimo inflato, ultimo antrorsum deviante ; 
umbilica angusto, non pervio; aperturd perobliqud, semicircu- 
lari, dente minuto parietis aperturalis munitd ; peristomate 
albo, subincrassato, breviter reflexo. 
Diam. maj. 8, min. 6, alt. 5 mill. 
Hab. Demerara. 
2. Srrepraxis Cumrinerana, Pfr. Str. testd perforatd, de- 
presso-globosd, soliduld, glabrd, virenti-albidd ; spird sublate- 
rali, conoided ; anfractibus 7 angustissimis, subplanis, penul- 
timo prominulo, ultimo antrorsum deviante ; aperturd perobli- 
qud, auriformi, lamelld intrante parietis aperturalis coarctatd; 
peristomate simplice, breviter expanso, marginibus callo tenui 
junctis, dextro arcuato, inferné dente 1 acuto munito, basali 
stricto, dente | transverse elongato instructo, columellari bre- 
vissimo, ad perforationem non perviam subreflexo. 
Diam. maj. 62, min. 51, alt. 4 mill. 
Locality unknown. 
3. Hexix Monssont, Pfr. H. testd perforatd, turbinatd, tenui, 
levi, carinatd, striis incrementi et lineis confertissimis impres- 
sis, oblique antrorsum descendentibus subtilissimée decussatd, 
diaphand, albidd, rubro-unicingulatd ; spird conoided, apice 
obtusiusculd ; suturd submarginatd ; anfractibus 6 subplanu- 
latis, ultimo magno, infra cingulum carinato (carind antice ob- 
