50 HELIX §. 20. 



284. H. pcrfucata Benson. •{• 



«T. vix perforata, depressa, translucente, purpureo-fusca, 

 polilissiina; spira clevatiuscula, sulura submarginata , apice ob- 

 luso; anfr, 4 convexiusculis, arcte convolutis, ullimo rotundato, 

 subtus convexo; apertura lunata, vix ol)]iqua; perist. rccto, 

 acuto, margine columellari verticali, leniter reQcxo; umbilico 

 non pervio. — Diam. maj. 5, min. 4, axis 3 mill.» (B.) 



Ilelix perfacata Bens. in Ann. and Mag. N. H. 2d. ser. XII. p. 93. 

 Nanina perfucata (Xesta) Pfr. Vers. p. 120. 



llabitat in pago Gallensi insulae Ceylon (Layard). 



285. pinguis Krauss. [Rv. n. 200. t. 43. — Nanina 



pinguis [Xcsla] Pfr. Vers. p. 120.) Mon. III. p. G4. 



286. albicans Pfr. {Rv. n. 335. t. 65. — Ch. ed. nov. III. 



p. 294. — Hyalina P/"/-. Vers. p. 123.) - - - 64. 



287. H. Lardyi Charpcntier. 



T. vix perforala, depressa, tenuis, levissime striatula, 

 nitida, pellucida, corneo-albida; spira vix conoideo-elata, ver- 

 lice subtili; sutura profunda; anfr. 6 convexi, angusti, ultimus 

 ventrosus, non descendens; apertura parum obliqua, lunaris; 

 perist. simplex, rectum, margine dextro antrorsum arcuato, 

 columellari ad perforationem brevissime reflexo. — Diam. maj. 9, 

 min. 8, alt. SVa miH- (Mus. Charpentier.) 



Helix Lardiji Charp. in litt. 

 _ _ pfr. in Zeitschr. f. Malak. 1853. p. 145. 



— — (Microcystis) Pfr. Vers. p. 123. 



Habitat in insula Opara. 



288. cgenula Wlor. (Coll. 1I3. — Ch. ed. nov. III. 



p. 317. — liv. n. 1415. t. 201. — Microcystis 



Pfr. Vers. p. 123.) Mon. III. p. 65. 



289. columcUaris Pfr. (Coll. 114. — Ch. ed. nov. UI. 



p. 417. t. 148. f. 8—10. — Erepta Pfr. Vers. 



p. 128.) - - - 65. 



290. oleosa Pfr. [Ch. ed. nov. III. p. 354. — Rv. n. 



1400. t. 201. — Microcystis Pfr. Vers. p. 123.) - - - 65. 



291. H. Thwaitcsi Pfr. 



T. aperte perforata, convexo-depressa, striatula, nitida, 

 cereo-hyalina ; spira breviter conoidea, obtusula; sutura pro- 

 funda, submarginata ; anfr. 6^2 convexi, arcte convoluti, ulti- 

 mus non descendens, basi inflalus; apertura verticalis, lunaris; 

 perist. rectum, acutum, margine columellari arcualim oblique 



