HELIX 



Plate LXn. 



Species 303. (Mus. Adams.) 



Helix Cooki.^xa. Hel. tettd iaperforatd, depre»»o-cono- 

 ided, Uriier driatuld, l<ecigald, iult epidermide corned 

 olid; tpird coHoided, obliud ; anfraclibus oclo ad 

 novem, convexu, uUimo cix ant/ulato, ba»i profundi «r- 

 catalo ; colttvielld brevi, perobliqud ; aperturd de- 

 presid, htnari,faiice lavielld baiali interruptd imtrw:td ; 

 perutoviate simpUci, acuta. 



Cook's Helix. Shell imperforated, depressly conoid, 

 faintly striated, smooth, whitish beneath a homy 

 epidermis ; spire conoid, obtuse ; whorls eight to 

 nine, convex, the last scarcely angled, deeply exca- 

 vated at the base; columella short, very oblique; 

 aperture depressed, lunar, interior furnished with an 

 interrupted lamella ; lip simple, acute. 



Gmelis, Syst. Nat. p. 3642. 



IleUjr ep'uityUum, Miiller (not of Ferussac). 

 Epiitylia cornea, Swainson. 



Hab. Jamaica. 



The species represented in this plate, peculiar in form 

 and texture, are characterized by a curious opake-white 

 lamellar ridge within the aperture. They constitute a well- 

 defined natural group, and have been elevated to the rank 

 of a genus by Swainson, with the name Epktylia. 



Species 309. (Fig. a, b, Mus. Cuming.) 



Helix torbefacta. Hel. ieitd imperforaid, conoided, 

 sui epidermide tenuimmd corned pell ucido-alid ; »pird 

 obtum ; anfractibus octo ad novem, eontexu, htiter 

 arcuatim itriatU, ultimo suianffulato, bast excavato ; 

 columelld calloid, subcontorld ; aperturd lunari, fauce 

 lamella iiulructd ; periitomate simplici, acnto. 



The scorched Heux. Shell imperforated, conoid, 

 transparent-white beneath a \-ers thin homy epider- 

 mis ; spire obtuse ; whorls eight to nine, convex, 

 faintly striated in an arched manner, the last slightly 

 angled, excavated at the base ; columella callous, 

 rather twisted ; aperture lunar, furnished with a 

 lamella in the interior ; lip simple, acute. 



.\dams, Contributions to Conchology, No. 2. p. 31. 



Hab. Jamaica. 



Of a much more elevated conical form than the pre- 

 ceding species, and uniformly smaller. 



Species 310. (Mus. Cuming.) 

 Helix F0RE1IA.\Ia.\a. Hel. tetia imperfomiA, Uii m- 



itriatit, ultimo lumidiuteMlo, cur aayulaio, bam pro- 



' - . . ■^- 



FoBEMAX's Helix. Shell imperforated, broadly conical, 

 rather stout at the I - ' .ith 



a homy epidermis ; - .-at, 



convex, striated in an arched manner, last wbori ratbrr 

 swollen, scarcely angled, deeply excavated at thr 

 base ; aperture lunar, furnished in the interior with 

 a lamella which is here and there interrupted ; lip 

 simple, acute. 

 Aj).ois, Contributions to Conchology, No. 5. p. SO. 

 Hab. Jamaica. 



Closely allied to H. Cookiana, but of a lar.' r :. i ■ i- 

 robust growth. 



Species 311. (Mas. Cuming.) 



Helix allioass. // '«, 



sub epidermide o..: .. ^ ,ri 



ad apieem obtuse depresid ; mfnetibtu aamem ad dectm. 

 planulatis, u ■»>- 



excacato ; «■ •- 



atructd; periitomate tenm, aeuto. 



The tied Helix. Shell i- -'— " ' '• ~ • '-al, 



transparent white bon<. ■^ • 



spire obtusely depressed ; « 't- 



tened, the last obtusely aii_. — ■.■ - ,.-"-'y 



excavated beneath ; aperture lunar, furnished in tbe 

 interior with a sm 



Adams, Contributions t. l 



Hai. Jamaica. 



Chiefly distinguished by its erect sugar-lo«f form »n«l 



depressly hollowed '•■ ■ 



Species 312. (.Mus. .Vdams.) 

 Helix coSNECTESS. Hel. te$ta imprrfunti, Imii eo- 



no ' 



sp- 



arcuatim stnatu, uitimo tuOanfuaU}. Mji luyrrtm,- 

 Decembcr, 1S51. 



