HELIX. 



Plate C. 



Species 550. (Mus. Cuming.) 



Helix labviuntiius. Hel. testa wnbilicata, lenticitlari, 

 niiniUe yranulatd, rufo-castaued ; anfraclihui quinqw, 

 convexinscului, ultimo bad conatricto, bkcrubiculalo ; 

 aperturd horizontali, auriformi, coarctatd; periitomate 

 subincrassato, breciter reflexo, sinuono, ad carinam ca- 

 tialicu/alo, marr/inibus callo alte prominenle, laminam 

 ereclam latam intrantem emittente junctis, ttipero 

 arcuato, hasali Jlexuoso, juxta canalem latnlnd latksimd, 

 triaiiffiilari, oppositam fere atli/iffeiite, et deiite valido 

 in medio itislriicto, lamina terlid parvuld in f undo. 



The l.vbyrintii Helix. SiicU urabilicated, lenticular, 

 minutely granulated, rcddish-cliestnut ; whorls live, 

 rather convex, the last constricted and two-furrowed 

 at the base ; aperture horizontal, ear-shaped, con- 

 tracted ; lip rather thickened, broadly reflected, si- 

 nuous, channelled at the keel, margins joined by a 

 high callosity, emitting a broad erect entering la- 

 mella, upper margin arched, basal flexuous, furnished 

 with a very broad triangular lamina next the canal, 

 nearly touching the opposite one, with a strong 

 tooth in the middle, and a third small lamina at the 

 bottom. 



Chemnitz, Conch. Cab. vol. xi. p. 271. pi. 208. f. 2048. 



Helix Otis, Solander. 



Eadcm var. CuracolUt aubplanata. Petit. 



Hab. Central America. 



Of the forms here collected together, this is considered 

 to be the type of the old H. labyrinthus. 



Species 551. (Mus. Cuming.) 

 Helix stostom.v. IM. tesld umbiUcatd, lenticulari, siii- 

 obesd, rufo-caslaned ; atifraclibuH quinque, plano-con- 

 vexis, ultimo conatricto et profundi scrobiculato ; aper- 

 turd hori:ontaU, auriformi, coarctatd; periitomate 

 subiiicrasaato, etevato, marginibua integria, lamellam 

 prominentem in pariete formantibua, margine columel- 

 lari dente unico valido, basali denlibua duobua lamelli- 

 forinibus, ad baain coadmiatia et callosia. 

 The plait-mocth Helix. Shell umbilieated, lenticular, 

 rather stout, reddish-chestnut ; whorls five, flatly 

 convex, the last constricted and deeply furrowed ; 

 aperture horizontal, ear-shaped, contracted ; lip rather 

 thickened, raised, with the margins entire, forming a 

 prominent lamella on the inner wall of the body- 



Mav, 



whorl, columcUar margin with a single strong tooth, 

 basal margin with two Inmellifomi teeth, united to- 

 gether and callous at the I)a8c. 



Pfeiffeu, Pro. Zool. Soc. 1851-2? 



Ilab. Andes of New Granada. 



Smaller and stouter than the preceding species. The 

 aperture is not channelled at the keel ; and in the placr 

 of the triangular basal lamina are two lamelliform teeth, 

 callous and united at the base. 



Species 552. (Mus. Cuming.) 



Helix uncicera. Hel. teatd umbiUcatd, orbicutari, »ub- 

 discoided, acutiaaime carinatd, minute granutatd, alia, 

 faaeiis nigro-fuacia cinctd ; apird vix eltvatd ; anfrac- 

 tibita quinque, plania, ultimo baai planiutcuh, antice 

 auiitu de/lexo, aubtua acrobicu/ato ; aperturd horizontali, 

 rhombed, kmelld validd alia pariete coarctatd; peri- 

 atomale aubincraasato, marginibua callo funiculato junc- 

 lia, aupero expanao, basali reflexo, juxta carinam la- 

 mella tenui inlrante, retroraum uncinaid, et prope coIm- 

 mellam dente obtuao armato. 



The hook-beauing Helix. Shell umbilieated, nrl)irular, 

 somewhat discoid, verj' sharply keeled, minutely 

 granulated, white, encircled with two black-brown 

 bands ; spire but little rais<-d ; whorls five, flat, the 

 last rather flat at the i>ase, suddenly deflected iu 

 front, furrowed beneath ; aperture horizontal, riiom- 

 boid, contracted, with a strong white lamella on the 

 wall of the body-whorl: lip slightly thiekencti, 

 margins joined by a corded callosity, upper margin 

 expanded, basal reflected, with a thin entering la- 

 mella next the keel turning buck into a fine hook, b 

 blnnt tooth next the columella. 



Carocolta uiicigera. Petit, Uueriu's Mag. dc Zool. 1S3'*. 

 Moll.pl. 113. 



Hab. Panama. 



This extremely interesting species is charartcrizcd by 



the presence of a fine gracefully curved hook within 



the aperture. 



Species 553. (Fig. a, 6, Mus. Cuming.) 

 Helix PLICATA. JM. teatd umbiUcatd, orbicutari, acute 

 carinatd, utrinque cvncexd, aolidiutculd, cailaued eel 



1S52. 



