HELIX. 



Plate XL I. 



Species 182. (Mus. Cuming.) 



Helix viridis. Hel. lesld imperforatd, iuriiiiato-e/lobosd, 

 ienni, lavigala, sub epidermide viridi alba, fasciis 

 variis nigricniile-rufa ornatd ; spird conoided, apice 

 oblusimcidd; aiifracUbu.^ quinqite ad sex, convexiuscu- 

 Ik ; columella oblique strictiusculd ; aperturd lunato- 

 ovali; perktomate breviter incrassato, subreflexo, mar- 

 gitie columellari dilatato. 



The gkeen Helix. Shell imperforated, turbinately glo- 

 bose, thin, smooth, white beneath a green epidermis, 

 eneircled with various blackish-red bands ; spire 

 conoid, rather obtuse at the apex ; whorls five to six, 

 rather convex ; columella oblique, ratlier drawn out ; 

 aperture lunar-oval ; lip shortly thickened, slightly 

 reflected, columcUar margin dilated. 



Deshayes, Anim. sans vert. (2nd edit.) vol. viii. p. 102. 



Hab. Madagascar. 



M. Deshayes takes this species to be the Trockus hor- 

 ■toMW of Chemnitz (Conch. Cab. vol. ix. pi. 122. f. 1055- 

 6). It is possible, but doubtful, the figure being a \ery 

 obscure one. 



Species 183. (Fig. a, b, Mus. Cuming.) 



llr.Lix c.i:latura. Eel. testa imperforatd, depreaso-glo- 

 bosd, solidiusculd, striis incremenii distinctis lineisque 

 spiraUbits puncluratis irreijidariter dklmdibiis excavatd, 

 fidvido-fuscd, apicem versus jmrpiirasrente ; spird brevi, 

 late conoided; anfractibus quatuor ad quinque, convex- 

 iuscnlis, ultimo basi juxta rolumellam compresso ; aper- 

 turd luuaio-ovali ; perktomate recto, subincrassato, 

 margine dextro sinuoso, columellari calloso. 



The embossed Helix. Shell imperforated, deprcssly 

 globose, rather solid, engraved with distinct stria; of 

 growth and iiTcgularly distant punctured spiral lines, 

 yellowish-brown, purplish towards the apex ; spire 

 short, broadly conoid ; whorls four to five, rather 

 convex, the last compressed at the base next the 

 columella ; aperture lunar-oval ; peristome straight, 

 rather thickened, right margin sinuous, columellar 

 margin callous. 



Ferussac, Hist. Moll. pi. 28. f. 3, 4. 

 Helix exarata, Wiegman. 



Ilab. Island of Bourbon. 



A broad Trochiform shell engraved with spiral punc- 



tured lines, and rather impressed around the scat of the 

 columella. 



Species 184. (Mus. Cuming.) 



Helix ompualodes. Hel. testa Me umbdicatd, depressd, 

 solidd, leviler striatuld, nigricante-castaned ; spird vix 

 convexd ; anfractibus quinque, plnniusculk, ultimo sid>- 

 carinato, antice vix descendente, basi paulo convexiore, 

 circa undiiliacm magnum spiratem suicompresso ; 

 aperturd perobliqud, lunato-ovali ,• perktomate breviter 

 re/lexo, marginibus conniventibus. 



The shield-like Helix. Shell umbilicated, depressed, 

 solid, finely striated, blackish-chestnut ; spire but 

 Little convex ; whorls five, rather flattened, last whorl 

 slightly keeled, scarcely descending in front, base a 

 little more convex, rather compressed around the um- 

 bilicus, which is large and spiral ; aperture very 

 oblique, lunar-oval; lip shortly reflected, brown, with 

 the margins approximating. 



Pfeifiek, Pro. Zool. Soe. 1845, p. 64. 



Hab. ? 



Characterized by a peculiarly compressed growth about 

 the base of the last whorl, surrounding a broad perspec- 

 tive umbilicus. 



Species 185. (Fig. a, b, Mus. Cimiing.) 



Helix xystera. Hel. testd umbUicatd, orbiadari, de- 

 pressd, aculissime carinatd, lenui, diap/iaud, olivacto- 

 fuscd; suturd Itevissimd ; anfractibus quatuor, plants, 

 ultimo supra superjicialiter ruguloso et malleaio, basi 

 convexo, circa umbilicum infundibnliformem subangu- 

 latu ; aperturd perobliqud, depressd, irregulari ,- pe- 

 ristomate rejkxo, margine supero dilatato, rolumfllari 

 brevi, cum basali angulum obtusumformanU. 



The shorn Helix. Shell umbilicated, orbicular, de- 

 pressed, very sharply keeled, thin, diaphanous, olive- 

 brown ; suture very smooth ; whorls four, flattened, 

 the last superficinlly wrinkled and indented on tlie 

 upper surface, convex at the base, mtlier angulatcd 

 around the umbilicus, which is funiu^l-shaped : apt r- 

 ture ver)- obli(|ue, depressed, irrcpilar ; lip reflected, 

 upper margin dilated, eolumellnr margin short. 

 forming an obtuse anijle with the basal margin. 



Valenciennes, Pfeiffer, Synilxilie. vol. i. p. 41. 



September, 1851. 



