HELIX.— Plate LXXLX. 



Poiket's Helix. Shell scarcely uinbilicated, cone-shaped, 

 obliijucly finely striated, whitish, faintly tinged with 

 light brown ; spire raised, somewhat papillary at the 

 apex ; whorls seven, llatly convex, last whorl obtusely 

 angled at the periphery, and obscurely encircled with 

 an interrupted brown band ; ajjcrture rather small, 

 somewhat square; lip simple, a little thickened within, 

 margins rather approximating, columellar margin 

 broadly thinly reflected and dilated, entirely covering 

 the umbilicus. 



Pfeiffer, Pro. Zool. Soc. 1851. 



Hall. Port Essington, Australia. 



An elevated cone-shaped species, not distinguished by 

 any pecidiarity of marking. 



Species 419. (Mus. Cuming.) 



Helix Gaektnekiana. lid. testa umbilkatd, conifurmi, 

 loHdmsculd, oblique conferlim pUvato-slriatd, nord'uli 

 aldidd aut fulvescente ; spird elevatd, apice subpapil- 

 lari ; anfractibm septem, sulangustis, plano-couvexiK, 

 ultimo ad peripheriam obtuse angulato, lined lenui rujd 

 conspiciii cinffulato, bad planulato ; umbilico angusto, 

 subprofundo ; aperturd transverse quadratd ; pertsto- 

 viate alba, calloso, rejlexo, maryine columetlari dilatato, 

 purpureo-violaceo. 



trAEETNEu's Helix. Shell umbilicatcd, cone-shaped, 

 rather solid, obliquely closely plicately striated, du-ty 

 white or pale fulvous ; spire elevated, somewhat pa- 

 pillary at the apex ; whorls seven, rather narrow, 

 flatly convex, last whorl obtusely angled at the peri- 



phery, conspicuously encircled with a fine red line, 



rather flat at the base ; aperture transversely square ; 



lip white, callous, reflected, columellar margin dilated, 



purple-violet. 

 Pfeiffer, Pro. Zool. Soc. 1851. 

 Ilab. Night Island, North Australia (ou trunks and 



branches of a Dombax) \ Macgillivray. 

 Another elevated cone-shaped species, in which the last 

 whorl is encircled with a strongly painted red tliread-like 

 line, while the columellar margin, which is reflected over 

 the umbilicus, is stained with a characteristic purple-violet 

 blotch. 



Species 420. (Mus. Cuming.) 



Helix immaculata. Hel. testa angnste umbilicata, tenui, 

 ylobusd, obliqui tenuiitriald, albitld, seviipellucidd, epi- 

 dermide tenui cornea partim indutd; spird subconoideS; 

 niifractibus quinque ad sex, plano-conrexis, ultimo ob- 

 tuse cariuato ; aperturd Itinato-orbiculari : perislomafe 

 tenui, parnm reflexo. 



Tue unspotted Helix. Shell narrowly umbilicated, 

 thin, globose, obliquely finely striated, whitish, semi- 

 transparent, partially covered with a thin homy epi- 

 dermis ; spire subeonoid ; whorls five to six, flatly 

 convex, last whorl obtusely keeled ; aperture limately 

 orbicular : lip thin, but little reflected. 



Adams and Reeve, Zool. Voy. Samarang, Moll. p. 62. 

 pi. 16. f. 5. 



Hah. Philippine Islands. 



A semitrauspareut white, horn-clad shell, with an obscure 



ring-like keel round the periphery of the last whorl. 



