HELIX.— Plate CXC. 



Another small liorny species from the remaining stores 

 of the voyage of the Sulphur. 



Species 1382. (Mus. Cuming.) 



Helix Thomasi. Ilel. te»ld Ittte per»pective umiilicafd, 

 depreiso-pland, tubd'ucoidea, pellucido-titred, pallidi 

 olitaceS, obsoUti arcualo-ttriald ; at{frartiiu3 (jimlnor 

 ad qiiiiiqiii; lenle accreacenliiua, ultimo rolundato ; 

 aperlurd lunato-circulari, labro aculo. 



Thomas's Helix. Shell broadly perspcctivcly umbili- 

 cated, depressly flattened, subdiscoid, transparent 

 glassy, pale olive, obsoletcly arcuatcly striated ; 

 whorls four to five, increasinii; slowly, the last 

 rounded ; aperture lunar-circular, lip sharp. 



Ppeiffer, I'ro. Zool. Soc. 1S54. 



Ualj. Marraata, New Granada; Bland. 



A simple olive-glassy discoid shell, obsoletcly striated 

 and rather largely umbilicatcd. 



An interesting species, of a new and peculiar type of 

 form. 



Species 1333. (Fig. a, b, Mus. Cuming.) 



Helix nematophora. Ilel. testa obtecle umbilicatd, glo- 

 bom-dUcoided, ttndique dense Jilo-striatd, subcorned, 

 rufo nitiJi ulrigatd et lesHellatd ; spird obtiusi planald; 

 anfractibm qimtuor ad qiiinque, ultimo lumidimculo ; 

 aperlurd lale luiiari, labro simplici, ad umbilicum in 

 laminam dilatatam appreuo. 



The tukeaded Helix. Shell with a deeply covered 

 umbilicus, globosely discoid, densely thread-striated 

 throughout, subhorny, neatly streaked and tessel- 

 lated with red; spire obtusely flattened; whorls 

 four to five, the last rather swollen ; aperture broadly 

 lunar, lip simple, oppressed at the umbilicus into a 

 dilated lamina. 



Pfeiffeu, Pro. Zool. Soc. 1854. 



IlaL. Solomon's Island. 



Species 1334. (Mus. Cuming.) 



Helix PUTEOLUS. Ilel. testa lati profundi iwtbHicati, 

 depresso-diKoided, virescmte-cornrd.radiatim siriulald, 

 ad perijiheriam eximii bicariuatd ; xpird oblute pla- 

 nald ; au/ractiius sex, superni aiiffutatis, infra rom- 

 vexo-declipibus ; aperlurd eompresso-lunari, labro aruto. 



The little well Helix. Shell broadly deeply unibili- 

 cated, depressly discoid, preenish-homy, radialely 

 striated, dcliciitcly two-keeled at tlie p«-riphery ; spire 

 obtusely flattened ; whorls six, angled at the upper 

 part, convexly slanting beneath ; aperture compressly 

 lunar, lip sharp. 



Benson, MS. (Mus. Cuming.) 



JIai. Ceylon; Cuming. 



Characterized by a fine double keel which runs through- 

 out the spire, and a broad wcU-like umbilicus. 



Species 1335. (Mus. Cuming.) 



Helix umbrina. Jlel. testa vix umbilicaid, deprtno- 

 orbiculari, fusco-citred, l<erigald, politd ; anfractibut 

 quatuor, plano-conrexis, ad sutnram submargiuati* ; 

 aperlurd late lunari, labro simplici. 



The suady Helix. Shell scarcely umbilicatcd, depressly 

 orbicular, brown, glassy, smooth, polished ; whorls 

 four, flatly convex, faintly margined at the suture; 

 aperture broadly lunar, lip simple. 



Pfeiffer, Pro. Zool. Soc. 1854. 



II(dj. Ceylon ; Thwaites. 



A red-brown transparent glassy shell, smooth and shi- 

 ning throughout. 



