126 



7. Description of a new species of Cytherea. 

 By Lovell Reeve, F.L.S., F.Z.S. etc. 



Cytherea nobilis. Cyth. testa orbicidari-cordatd, crassd, trans- 



versim concentric^ liratd, liris rudibus, obtusis, subplanulatis, 



numerosis, crebris, valde irregularibus, hie illic intermissis, non 



parallelis ; laeted, epidermide tenui corned, translueidd, indutd. 



Long. 41 in. ; lat. 2\ in. ; alt. 4 in. 



Hab. ? 



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 of H. Cuming, Esa. 



By Dr. L. Pfeiffer. 



1. Streptaxis glabra, Pfr. Str. testd umbilicatd, depressh 

 ovatd, tenui, •pellucidd, virescenti-albidd, omnino glabrd ; spird 

 laterali, acutiusculd ; suturd albo-marginatd ; anfractibus 6 

 convexiusculis, penultimo inflato, ultimo antrorsum deviante ; 

 umbilico angusto, non pervio ; aperturd perobliqud, semicircu- 

 lari, dente minuto pnrietis aperturalis munitd ; peristomate 

 albo, subincrassato, breviter reflexo. 



Diam. maj. 8, min. 6, alt. 5 mill. 

 Hab. Demerara. 



2. Streptaxis Cumingiana, Pfr. Str. testd perforatd, de- 

 presso-globosd, soliduld, glabrd, virenti-albidd ; spird sublate- 

 rali, conoided ; anfractibus 7 angustissimis, subplanis, penul- 

 timo promhiulo, ultimo antrorsum deviante ; aperturd perobli- 

 qud, auriformi, lamelld intrante parietis aperturalis coarctatd; 

 peristomate simplice, breviter expanso, marginibus callo tenui 

 junctis, dextro arcuato, inferne dente I acuto munito, basali 

 stricto, dente 1 transverse elongato instructo, columellari bre- 

 vissimo, ad perforationem non perviam subrejlexo. 



Diam. maj. 6|, min. 5i, alt. 4 mill. 

 Locality unknown. 



3. Helix Monssoni, Pfr. H. testd perforatd, turbinatd, tenui, 

 levi, carinatd, striis incrementi et lineis confei'tissimis impres- 

 sis, oblique antrorsum descendentibus subtilissimh decussatd, 

 diaphand, albidd, rubro-unicingulatd ; spird conoided, apice 

 obtusiusculd ; suturd submarginatd ; anfractibus 6 subplanu- 

 latis, ultimo magno, infra cingulum carinato (carind antice ob- 



