HELL\.— Plate XXXVII. 



orbiculated, thin, smooth, shining, transparent, 

 greenish-hyaline; spire depressly conoid; suture 

 sli'^'htly marinated ; whorls four, scarcely convex, 

 increasing gradually, last whorl not descending; 

 aperture but little oblique, rotundately lunar; lip 

 simple, straight, columelhir edge short, arched, a 

 little reflected at the upper part. 



Pfeifieb, Pro. Zool. Soc. 1848, p. lO'J. 



Hab. Islands of Camiguing and Luzon, Philippines; 

 Cuming. 

 A small delicate species having somewhat the form of 



Tltriiia, and referred to that genus in manuscript by Dr. 



Beck, imder the name r.suturalu. 



Species 1G9. (Fig. a, 4, Mus. Cuming.) 



IIei.I\ ARClWT.v. Hel. te-iin umhilicata, orhiculato-con- 

 rexa, tenui, pellucidd, pallide corned, conferlim et re- 

 yulariter nreuato-plicaid ; xpird laie cuuoided, apice 

 obtwdwsculd ; anfractifiu-1 sex, vix concexiiuculis, carina 

 acuta lurrrutatd mari/iiialiji, ultimo circa miiiilictini 

 nuufnumfere cylindraceum subcompresso ; aperiurd an- 

 gulato-lunari, lata ; perlitomaie mmplici, acuta, margine 

 columellari brevi, terlicali. 



The AifcuATED Helix. Shell umbilicated, orbicularly 

 convex, thin, pellucid, pale homy, closely and regu- 

 larly arcuately plicated ; spire broadly eonoidal, ra- 

 ther obtuse at the apex ; whorls six, but little convex, 

 edged with a sharp serrulated keel, last whorl com- 

 pressed around the umbilicus, which is large and 

 almost cylindrical ; aperture angularly lunar, broad ; 



lip simple, sharp, with the columellar edge short and 



vertical. 

 Pfeiffeu, Pro. Zool. Soc. 1&-16, p. llo. 

 Uab. Cagayan, Island of Luzon, Pliilippines ; Cuming. 



The whorls of this species are convoluted round a broad 

 perspective umbilicus, and are delicately sculptured on 

 the upper surface by close-set plicated stria. 



Species 1 70. (Mus. Cuming.) 



Helix cyatuellcs. Hel. tettd uwbHicatS, conicd, ob- 

 lique plicaiostriald, costatd, tenuiculu, corned ; spird 

 pyramidaid, acutiuiculd ; anfracUbus nocevi, angu»- 

 lisniuiia, carina filiformi cinct is, ultimo ban plaiiiusculo, 

 sublavigato ; uniiilico majusculo, percio ; aperturd 

 depressd, angidato-lunari ; periilomat^ simplici, mar- 

 gine supero brevi, recto, basali leviter arcuato, brevis- 

 simi rejlexo. 



The little-cup Helix. Shell umbilicated, conical, ob- 

 liquely plicately striated, very thin, horny ; spire 

 pmraidal, rather sharp ; whorls nine, ver\' narrow, 

 encircled by a thread-like keel, last whorl rather flat 

 and smooth at the base ; umbilicus large, open ; 

 aperture depressed, angularly lunar ; lip simple, up- 

 per edge short, straight, basal edge slightly arched, 

 verj' shortly reflected. 



Pfeiffeb, Pro. Zool. Soc. 1846, p. 41. 



Uah. Dingle, Island of Pauay, Philippines ; Cuming. 



Very similar in form to the preceding species, but lai^r, 

 with more whorls. 



