HELIX.— Plate XCI. 



chestnut ; spire elongated, ratlier sliarp ; wlioils six, 

 rather llntteneil, the last obsoletely angled, flat at 

 the base, chestnut ; columella short, oblique ; aper- 

 ture Iunar-o\ al ; lip simple, broadly expanded, white, 

 upper margin slightly arched in front, basal reflected, 

 columellar margin dilated and reflected, almost con- 

 cealing the umbilicus. 



Mt'LLER, Verm. Hist. terr. et fluv. vol. ii. p. 80. 

 Jlel'tx pUeata, Gmelin. 

 Trochus pileua, Chemnitz. 

 (Jeolrocftm pilevs, Swainson. 



Hab. Amboyna; Hinds. 



This well-known erectly-conical species varies more or 



less in the chestnut-banded paiutiug, but is constant in 



form. 



Species 494. (Mus. Cuming.) 



Helix Janus. Hel. testa umbiUcatd, sinktrali, orbicu- 

 lari, tenui, diapliand, ubliqui reijulariter et confertim 

 costulaio-striatd, superne fused, basi convexd, rufo-cas- 

 ianed, nilidiusculd ; spird late conoideo-depressd ; an- 

 fractibiis septem, planulatis, ullimo carinato ; aperturd 

 luiiari; perislomate tenui, aciilo, margine columellari 

 reflexiusculo. 



The Jani;s Helix. Shell iimbilieatcd, sinistral, orbicu- 

 lar, tliin, diaphanous, obliquely regulai'ly and closely 

 finely rib-like striated, brown .it the upper part, base 

 convex, reddish-chestnut, shining ; spire broadly 

 conoidly depressed ; whorls seven, rather flattened, 

 the last keeled; aperture lunar ; lip thin, sharp, co- 

 lumellar margin slightly reflected. 



Helix Janm bifrons, Chemnitz, Conch. Cab. vol. xi. p. 307. 

 pi. 213. f. 3016-17. 

 Helix Muckensiana, Souleyet. 

 Helix Balesteriatta, Lea. 



Hab. Mount Ophir, Malacca. 



A sinistral shell, of a warm reddish-chestnut colour, 

 with the upper surface beautifully finely rib-like striated. 



Ppeiffeu, Zeitsehrift fiir Make. 1850. p. 87. 

 Hab. Japan. 



A thin inflated roughly striated shell, partaking of the 

 typical form of Paludina. 



Species 495. (Mus. Cuming.) 



Helix Sieboldiana. Hel. testd vix umhiUcatd, turbinatd, 

 tenui, semipellucidd, injlald, oblique rude striata, cor- 

 neo-albd ; aufractibus quinque ad sex, rotundatis ; aper- 

 turd circulari ; perintomate tenui, acuta, jiixta coln- 

 meltam breviter dilalato et reftexu, umbilicuin occul- 

 tante. 



.Siebold's Helix. Shell scarcely unibilicatcd, tnrbiiuited, 

 thin, semitransparent, obli(iuely rudely striated, 

 homy-white ; whorls five to six, rounded ; aperture 

 circular ; lip thin, shaqi, shortly dilated and reflected 

 next the columella, concealing the umbilicus. 



Species 496. (Mus. Cuming.) 



Helix Japokica. Hel. testd umiilicatd, trochiformi, 

 tenui, plicato-striatd, interstitiis minute impresso-linea- 

 tis, epidermide comeo-stramined indutd ; spird conrexo- 

 conoided, apice obtuaiusculd ; anfradibus quinque ail 

 sex, subplanis, ultimo carinato, antice vix descendente, 

 basi vix convexo, juxta umbilicum anffuslum pervium 

 conipresso ; aperturd obliqud, sinuato-luuari ; peristo- 

 viate tenui, breviter expanso, marifine dextro arcualo, 

 basali strictiusculo. 



The Japan Helix. Shell unibilicatcd, trochus-shaped, 

 tliin, plieately striated, the interstices being minutely 

 imprcssly liueated, covered vvith a homy-straw epi- 

 dermis ; spire convexly conoid, rather obtuse at the 

 apex ; whorls five to six, rather flat, the last keeled, 

 descending in front, slightly convex at the base, 

 compressed next the umbilicus, which is narrow and 

 open ; aperture oblique, sinuately lunar ; lip thin, 

 shortly expanded, right margin arched, basal margin 

 rather drawn out. 



Pfeiffer, Zeitsehrift fiir Malac. 1847. p. 146. 



Hab. Japan. 



A light homy trochus-shaped shell, covered with a 

 delicate deciduous epidermis, beneath which the inter- 

 stices between the plicated strinc of the shell arc spirally 

 minutely impressly lineated. 



Species 497. (Mus. Cuming.) 



Helix conformis. Hel. testd imperforatd, coinpressd, 

 carinatd, minute striata, albd, diaphand, epidermide 

 tenui corned stramined indutd; anfractibut triius ad 

 quatuor, ultimo magno, dilalato ; aperturd magna ; 

 perislomate rejlexo, angusto, latere columellari de- 

 presso, recto. 



The conformable Helix. Shell imperforated, com- 

 pressed, keeled, minutely striated, white, diaphanous, 

 covered with a thin horny straw-coloured epidermis ; 

 whorls three to four, the last large, dilated ; aperture 

 large ; lip reflected, narrow, columellar side de- 

 pressed, straight. 



Fercssac, Hist. Moll. pi. i5 A. f. 10. 



Hab. Timor. 



Verj' tliin and of very transparent substance, but firm, 

 covcrt^d with an extremely delicate shining horny epi- 

 dermis. 



