HELIX. 



Plate XLII. 



Species 188. (ilus. Cuming.) 



Helix Barcl.\y.\x.\. Hel. testa umbilicalS, depresso-tur- 

 binata, coiifertim oblique tetiuissime costatd, alba, epi- 

 dermide fusco-olivaced indutd; spird conoided, apice 

 obtitsd ; suturdprofundd; anfradibus quingue ad sex, 

 coiicexk, ultimo medio carinato, interdum obsolete bi- 

 cariiiato, basi convexiiisculo ; umbitico mediocri, fere 

 cylindraceo ; aperturd subcerticali, quadrangulari ; 

 perisiomate simplici, acuto, margine columellari ver- 

 ticuliter descendente, cum basali angulum formanle. 



Barclay's Helix. Shell umbilicatecl, depressly turbi- 

 nated, closely obliquely very finely ribbed, white, 

 covered with a brown-olive epidermis ; spire conoid, 

 obtuse at the apex ; suture deep ; whorls five to six, 

 convex, the last keeled round the middle, sometimes 

 obsoletely two-keeled, rather convex at the base; 

 umbilicus middling, almost cylindrical ; aperture 

 nearly vertical, quadrangular ; lip simple, sharp, co- 

 lumellar margin descending vertically, forming an 

 angle with the basal margin. 



Pfeiffer, Pro. Zool. Soc. 1S16, p. 110. 



Hob. Mauritius. 



Sculptured throughout with very fine close-set ribs. 

 The aperture is of a peculiar vertical quadrangular form, 

 with the lip unreflected. The species is named in honour 

 of Sir Darid Barclay, an assiduous collector of shells, re- 

 siding near the locality iu which it occurs. 



Species 189. (Mus. Cuming.) 



Helix Mauritiana. Hel. testa vix umbilicatd, orbiculari, 

 depresso-conoided, tenuiculd, supra oblique cosiulatd, 

 iiifra Usvigald, olivaceo-fuscd ; anfraclibm sex ad 

 septem, carina acuta ad peripheriam fuiiiculatis ; 

 aperturd subcerticali, laLro simplici. 



The Mackitils Helix. Shell scarcely umbUicatcd, or- 

 bicular, depressly conoid, rather thin, obliquely finely 

 ribbed above, smooth beneath, olive-brown ; whorls 

 sis to seven, corded round the periphery with a sharp 

 keel; aperture somewhat vertical, lip simple. 



Pfeiffer, Pro. Zool. Soc. 1851. 



Hai. Mauritius. 



The fine ribs upon the upper surface of this species are 

 slightly obliquely arched, and more distant thau in the 

 preceding. 



Species 190. (Mus. Cuming.) 



Helix UXICOLOR. ffel. testd umiilicaid, dtprena, acu- 

 tissime carinata, tenui, rufo-funcd, superne nublUiler 

 stria td, subtus stria td et malleald ; .-, ' " ' 

 conoided; aitfractibiu qiiinque, plaiiii 

 accrescenlibus, ultimo antice nor, detcendenU, ban coh- 

 rexo, ad uiMlicum angiutum abrupli angulato ; aper- 

 turd rlwmboided; periatomaie purpureo-fiuco, mar- 

 ginibus supero dilalato, erpatiso, Ijasali atcendenU, 

 stricto, columellari breri, dilatato, umbiiinm, .*nn'- 

 occultante, cum basali angulatimjuncto. 



The one-colocred Helix. Shell umbilicated, de- 

 pressed, very sharply keeled, thin, red-brown, finely 

 striated on the upper surface, striated and indented 

 on the lower ; spire depressly conoid ; whorls five, 

 rather flat, enlarging gradually, the last not descend- 

 ing anteriorly, convex at the base, abruptly angukied 

 around the umbilicus, which is rather narrow ; aper- 

 ture rhomboid ; lip purple-brown, upper margin di- 

 lated, expanded, basal margin ascending, drawn out, 

 columcllai- margin short, dilated, half-concealing the 

 umbilicus, angularly joined with the basal margin. 



Pfeiffer, Pro. Zool. Soc. 1845, p. 64. 



Hab. ? 



The form and upper surface of this species is much the 

 same as in //. xystera. It differs priuci])ally in being 

 composed of five instead of four whorls, and in ha\iog a 

 more confined umbilicus. 



". 



Species 191. (Fig. a, b, Mus. Cuming.) 



Helix STYLODOX. Hel. testa imperfor 



soUduld, luteo-comed, aubtititer ttr, r- 



cussatd ; spird cii elerald; aii/ractiiM sex ad trpirm, 

 concexis, ultimo obtuse angulato ; apertyrd Immari ; 

 columelld dente obliquo, valido, albo uutmcld; peri- 

 stomale simplici. 



The hard-toothed Helix. Shell irapcrfonilctl, rather 

 depressed, rather solid, yellowish-homy, finely stria 

 ted, sometimes decussated ; - ' 



whorls six to scvcu, convex, tl; . ' 



aperture lunar; columella funushed with a strong 

 oblique white tooth ; lip simple. 



Pfeiffer, Symbola>, vol. ii. p. 40. 



Hab. JIauritius. 



September, 1851. 



