HELIX. 



Plate XL. 



Species 177. (Fig. a, b, Mus. Cuming.) 



Helix inversicolor. Hel. testa imperforata, orhicuhri, 

 utrinque convexa, acute carinatd, superne rufd, striata, 

 basi nigricante, striata el lineh concentricis distantibus 

 decussatd; spird brevi ; anfraclibus septem, planulatis ; 

 columella brevi, obliqud, callosd ; aperturd subquadran- 

 gulari ; peristomate subincrassalo, marginibus callo 

 tenui junciis, supero arcuato. 



The inverse-colocred Heli.x. Shell imperforated, 

 orbieular, convex on each side, sharply keeled, red- 

 dish and striated above, blackish beneath, striated 

 and decussated with couecutric lines ; spire short ; 

 whorls seven, rather flattened ; columella short, 

 oblique, callous; aperture somewhat square; lip 

 slightly thickened, margins joined by a thin callous 

 layer, upper margin arched. 



FERUSS.A.C, Hist. MoU. pi. .58 ./. f. 7-12. 

 Carocolla hicolor, Lamarck. 

 Carocolla Mauritiana, Lamarck. 



Badem var. Helix puerocuna, Peron. 



Hab. Mauritius. 



This species in fine condition is covered about the upper 

 surface with a delicate net-work of epidermis, as in the 

 specimen Fig. 177 i. 



Species 178. (Mus. Cuming.) 



'Ielix Duvalii. Hel. testd umbilicatd, orbiculatd, co- 

 ttico-depressd, castaned, tramversim hngitndinaliterque 

 striata ; anfraclibus qualuor ad quiuque, depresso- 

 coHvexiusculis, auturd impressd separatis et fascid 

 brimned marginatis, tdlimo medio zond lutescente 

 circumdato, subtus lutescente, ad vmbilicum nuidio- 

 crem pervium compresso ; aperlurd ampld, ovali; pe- 

 ristomate simplici, tenui, marginibus conniventibiis, 

 dextro vix expanse, basali breviter rejlexo. 



Duval's Helix. Shell umbUieated, orbicular, eonicaUy 

 depressed, chestnut, transversely and longitudinally 

 striated; whorls four to five, somewhat depressly 

 convex, separated by an impressed suture and edged 

 with a brown band, last whorl encircled round the 

 middle with a yellowish band, yellowish beneath, 

 compressed about the open umbilicus ; aperture large, 

 oval; lip simple, thin, margins approximating, right 

 margin a little expanded, basal margin shortly re- 

 flected. 



Petit, Mag. de Zool. 1844, pi. 93. 

 Hab. Madagascar. 



The stria; with which this species is transversely and 

 longitudinally sculptured have a granular ciiaracter. 



Species 179. (Mus. Hanley.) 



Helix Caffra. Hel. testd umbilicatd, in/aid, subde- 

 presso-globosd, tenui, fragili, coslulato-striatd, riridu/d, 

 fusco-viridi irregulariter sirigatd; spird brevi, obluta; 

 anfraclibus qualuor, coiicexiusailis, ultimo tubdepretto ; 

 aperlurd magnd, lunato-omli, intus margarilaced ; peri- 

 stomate tenui, acuto, simplici, tnarginibus callo tenui 

 junciis, columellari reflexo,perforationem semioccultanlt. 



TuE Caffre Helix. Shell umbilicated, inflated, sub- 

 depressly globose, thin, fragile, marked with rib-like 

 stria;, greenish, irregularly streaked with broHnish- 

 green ; spire short, obtuse ; whorls four, rather con- 

 vex, the last rather depressed ; aperture large, lunar- 

 oval, pearly within ; lip thin, sharp, simple, marsrins 

 joined by a thin callous layer, columellar margin re- 

 flected, half-concealing the umbilicus. 



Hab. Cape of Good Hope. 



An elegantly convoluted shell of delicate toxiun-. cou- 

 centrically corded, covered with a green epidermis, and 

 peculiarly iridescent in the interior. 



Species 180. (Fig. a, b, Mus. Cuming.) 



Helix COGNATA. Hel. testd ini/ierforatd, depresid, totidd, 

 transcerse ovatd, oblique striatd, obsolete granulotd, 

 nilidd, spadiceo-grised, punctis riifis irregularil''r n*- 

 persd ; spird brevissimd ; anfractiius quaiuor, ploHms- 

 culis, ultimo interdum medio pallide cingulato, bati 

 albo, injlato, antice breviter defleio ; aperlurd prr>J)- 

 liqud, transverse ovali, intus ni'.idd, licidd ; /vrn/',- 

 male albo, crasso, breviter rejlexo, margine columeUari 

 dilalalo, appresso, excavalo. 



The allied Helix. Shell im|>erlbmted, depressed, 

 solid, transversely ovate, obliquely striated, ob'dlfti-ly 

 granuled, shining, fawn-grey, irregularly sprinkliil 

 with redili.<h dots ; spire ven* short ; whorls four, 

 rather flattened, the last sonutinios faintly l)an>k'd 

 round tlie middle, base white, inflated, anteriorly 

 shortly deflected ; aperture very oblique, transvrp«ly 

 oval, shining and livid within; lip white, thickrmil. 



September, 1851. 



