HELIX. 



Plate LXIII. 



Species 315. (Mus. Cuming.) 



Helix OSCULANS. Hd. testa imperforatd, tenui, vilreo- 

 aliidd, clepresso-orbiculari ; spird oUusd ; mi/ractiius 

 quinque, oblique tenu'uainie el creberrime costulato-dri- 

 alis, ultimo cariiialo, basi excavalo ; aperturd depresio- 

 lunari, fame lamella tenui opaco-alhd munild. 



TuE INTERMEDIATE Helix. Shell imperforated, thin, 

 glassv white, dcpressly orbicular ; spire obtuse ; 

 whorls five, obliquely very finely and closely rib-bke 

 striated, last whorl keeled, excavated at the base ; 

 aperture dcpressly lunar, furnished in the interior 

 with a thin opake-white lamella. 



Adams, Contributions to Conchology, No. 7. p. 107. 



Hah. Jamaica. 



This little glassy shell belongs to the same tj'pe as the 

 group represented in the preceding plate. The whorls 

 are convoluted nearly in a discoid plane, and the internal 

 lamella shows distinctly through the base. 



Species 316. (Fig. a, 4, Mus. Cuming.) 



Helix Anthoniana. Ilel. testa umbilicatd, orbiculari, 

 peltucido-alid ; spird subelevald, suturd distinctd ; ati- 

 fractibm quinque, rotundalis, oblique tenuissitne striatis; 

 columelld bred, basi dilalatd ; aperturd depreua, lu- 

 nari ; perislomale tenui, acuto. 



Anthony's Helix. Shell umbilicated, orbicular, trans- 

 parent white ; spire slightly raised, suture distinct ; 

 whorls five, rounded, obliquely very finely striated ; 

 columella short, dilated at the base; aperture de- | 

 pressed, lunar ; lip thin, sharp. 



Ada-Ms, Contributions to- Conchology, No. 3. p. 35. 



Hab. Jamaica. 



A small glassy species, of a distinct type from the pre- 

 ceding which has an internal lamella. 



Adams, Contributions to Conchology, No. 3. p. 34. 

 Hab. Jamaica. 



A transparent horny subdiscoid shell closely allied lo 

 11. arboreoides. 



Species 318. (Fig. a, b, Mus. Cuming.) 



Helix Lamellifera. Jlel. tettd imperforatd, orbiculari, 

 subglobosd, corned, granuli» minuli* eUvatii tculpld ; 

 spird convexd, suturd distincld ; anfraclil/tu juim/ur, 

 contexts ; aperturd semilun/iri, fauce taituUd tCKuiuimd 

 instructd ; peristomatc simplici, acuto. 



The lamelliferods Helix. Shell imperforated, or- 

 bicular, subglobose, homy, sculpturetl with minuti- 

 raised granules ; spire convex, suture distinct ; 

 whorls five, convex ; aperture semilunar, furnished in 

 the interior with a very thin lamella ; lip simple, 

 acute. 



Adams, Contributions to Conchology, No. 2. p. 31. 



Hab. Jamaica. 



The granular sculpture wliich characterizes this species 

 is very unusual in a shell of homy substance. 



Species 317. (Mus. Cuming.) 



Helix similis. Ilel. testd umbilicatd, orbiculari, subdis- 

 coided, pellucido-corned ; spird depressd; anfractWus 

 sex, rotundatis, oblique striatui ; umbilico profunda; 

 aperturd semilunari ; peristomale simptici, acuto. 



The similar Helix. Shell umbilicated, orbicular, sub- 

 discoid, transparent horny ; spire depressed ; whorls 

 six, rounded, obliquely striated ; umbilicus deep ; 

 aperture semilunar; lip simple, acute. 



January, 



Species 319. (Mus. Adams.) 



Helix arboreoides. Tfel. tfsid imperforatd, dfpreud, 

 striatuld, tenui, nilidd, hyalind ; spird vix eleraid, oi- 

 iusissimd, suturd marginatd ; at\fractibHt fptem, rir 

 convexiusculi-1, ultimo antici hoh descendenU, basi mtdio 

 profundi excacalo; aperturd subcfrticali, obliqui lunart .■ 

 perislonmte simplici, acuto, marjiHe coUmeUari per- 

 obliquo, superni brevistimi rejiexo. 



The tree Helix. Shell imix-rforatcd, depressed, finoK 

 striated, thin, shining, hyaline ; spin- but little raisnl. 

 very obtuse, suture margined ; whurls seven, slightly 

 convex, the last not descending in front, deeply ei- 

 cavated in the miildlc at the base ; aperture somewhat 

 vertical, obliquely lunar; hp simple, acute, colu- 

 mellar margin very oblique, very shortly reflected 

 above. 



Adams, Pro. Nat. Hist. Soc. Boston, U.S., 1845. 



Ilab. Jamaica. 



A light hyaline horny shell, con»olut«l in a manner 



nearly discoid. 



1S52. 



