HELIX.— Plate CXI. 



prcssly orbicular, more convex beueatli, smooth, traus- 

 parcut, shining, bright horny; spu'c obtuse; whorls 

 four to five, convex, finely margined at the suture ; 

 aperture lunar ; lip sim|)le, callous near the columella. 



Pfeiffek, Zeitsclirifi fiir .Malac. 1850. p. GS. 



Hab. Marquesas Islands. 



A sniootli thin transparent bright horny shell, with the 

 lip a little callous next the columella. 



Species 63.5. (^lus. Cuming.) 



Hkmx bursatella. llel. testa umiilicatd, coiticd vel 

 planulatd, pervariabili, supra maculia fusch el alh'ulh 

 allertiantibm /lexitosln te.ssellatu, tiifra ciiiereo-al/iidd 

 eel Jlaimnulis fuscU Jlexuosis radiatd, coslk numerom- 

 nimis acutk radiantibna liratd, stibfus coiwexiusculd, 

 interditm simplici, interdum concent rice ftriatd, nunc 

 radiatim costellatd, nunc albidd, nunc fusco-Jlammula- 

 id ; anfraclibus ocio ad novem, exlerne excavaiis, ulti- 

 mo carinato ; sulurd impressd, plerumqiie marginatd ,- 

 aperlurd pared, transversa, fauce cum lamellii seplem, 

 quarum duabus superioribus, una columeUari, quatuor 



mwti-i fund supra, tribtis infra cnnnamj ad lairuiii 

 simplex ; umbitico cavernow, in juiiiuribus acetabuli- 

 formi, in majoribu* ad januam parvo, coiutriclo. 



TuE LITTLE TOWEK Helix. Shell umbilicatcd, conical 

 or rather flat, very variable, tessellated about the 

 upper part with alternating brown and white 

 rtcxuous spots, ash-whitc beneath, rayed with litllr 

 flexuous flames, sculptured with very numerous shar]> 

 radiatiui: ribs, rather convex biMieath, sometimes 

 simple, sometimes concentrically striated, now rayed 

 with tine ribs, now white, now brown-flamed ; whorls 

 eight to nine, excavated, the last keeled ; suture im- 

 pressed, generally margined ; aiMirture small, trans- 

 verse, with seven lamella.- in the interior, two of 

 which are superior, one columellar, and four a-mote 

 (one above the keel and three below it) from the lip, 

 which is simple ; umbilicus cavernous, in young sjje- 

 cimeus cup-shaped, in older specimens small and cun- 

 strietcd at the entrance. 



GoiLD, Expedition Shells, 1S16, p. 22. 



Ilab. Taliiti. 



An extremely characteristic species, partaking of the 

 characters and typical form of H. Jacquinoti. 



