106 HELIX 8. 20. 
impressa, submarginata; anfractibus 6, vix convexiusculis, lente 
accrescentibus, ultimo supra peripheriam obtusissime angulato, 
subtus convexo; apertura obliqua, anguste lunata; peristomate 
tenui, recto, subsinuato, marginibus superiore et basali leviter 
antrorsum arcuatis, columellari oblique descendente, leviter ex- 
panso. — Diam. maj. 10, min. 9, axis 4!/, mill.» (B.) 
Heliac Stephus Bens. in Ann. and Mag. n. h. 3d. ser. VII. (Febr. 
1861.) p. 84. 
Habitat ad Portum Blair Andamanicum. 
399. H. margarita Beck. 4 
«Testa angustissime perforata, orbiculato-depressa, vix 
striatula, nitida, pellucida, pallide flavescens; spira parum ele- 
vata, convexa; sutura distincta, plano-marginata; anfractus 4, 
ultimus magnus, rotundatus, antice non descendens, basi juxta 
perforationem leviter impressus; apertura vix obliqua, rotun- 
dato-lunaris; peristoma simplex, acutum, margine arcuato, colu- 
mellari incrassato, fornicatim reflexo. — Diam. maj. 8!5, min. 
7, alt. 4!/; mill.» (Alb. ex specim. authent.) 
Microcystis margarita Beck, Mórch Cat. Yold. p. 2. (Nomen.) 
Nanina margarita (Microcystis) Aib. Helic. ed. Mart. p. 50. 
Habitat in ins. Pitcairn. 
* 
393. (2:$.) succinea Pfr. (Coll. Nr. 149.) Nanina succinea (Micro- 
cystis) A?. 49. — Ins. Philippin. (I. 58.) 
394. (279. rustica Pfr. (Col. Nr. 150.) H. inconspicua Forb, — H. 
Crotali Cox Cat. Austr. landsh. p. 43. 48. —  Nanina rustica 
(Thalassia) A?. 59. — Australia. (III. 63.) 
395. H. impexa Eeevoe. T 
Cox: (Catal. Austral. landsh. p. 43) hane speciem, ad Eli- 
zabeth-Bay, Sidney lectam, ab H. inconspicua Forb. diversam 
declarat. 
396. H. Todarum W. et H. Blanford. 4 
« T. perforata, subdepressa, fulvo-cornea, tenuis, nitida 
striata; spira depresso-conica, apice acuta. Anfr. 5'/5 subpla- 
nulati, sensim accrescentes, ultimus haud descendens, subtus 
convexus, radiato-striatulus. Apertura vix obliqua, late luna- 
ris; perist. rectum, tenue, margine columellari breviter reflexo. 
— piam. maj. 44, min. 42, alt. 8 mill. Ap. 6 mill. alta, 7 
lata.» (Bl.) 
