Zoological Society. 291 



would be very happy to give you any information on the subject. 

 He told me that he found the above-mentioned skull among some 

 rubbish, and that it was a long time before they made out what 

 it was." 



PROCEEDINGS OF LEARNED SOCIETIES. 



ZOOLOGICAL SOCIETY. 



November 13, 1849. — William Yarrell, Esq., in the Chair. 



Description of a new species of Cytherea. 

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



Cytherea nobilis. Cyth. testa orbiculari-cordatd, crassd, frans- 



versim concentric^ liratu, liris rudibus, ohtusis, suhiilanulatis, 



nnmerosis, crehris, valde irregularihus, hie illic intennissis, nan 



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



Long, 4^ in. ; lat. 2\ in. ; alt. 4 in. 



Hah. ? 



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. 



Descriptions of twenty-four new^ species of Helicea, 



FROM THE Collection of H. Cuming, Esq. 



By Dr. L. Pfeiffer. 



1. Streptaxis glabra, Pfr. Str. testa umbilicatd, depresse 

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

 laterali, acutiuscidd ; siiturd al bo-mar g inat d ; anfractibus 6 

 convexiusculis, penidtimo infiato, idtimo antrorsum deviante ; 

 umbilico angusto, non pervio ; aperturd perobliqud, semicircu- 

 lari, dente mimito parietis aperturalis munitd ; peristomate 

 albo, subincrassato, breviter rejlexo. 



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 prominulo, ultimo antrorsum deviante ; aperturd perobli- 

 qud, auriformi, hmielld intrante parietis aperturalis coarctatd; 

 peristomate simplice, breviter expanso, marginibus callo tenui 

 juncfis, dextro arcuato, in/erne dente 1 aciito numito, basali 



