560 HELIX. 
S i 
166. Nicobarica Chemn. — Conch. Ind. t. 52. f. 1. 
167. semirugata Becls. — Conch. Ind. t. 59. f. 4. 
168. Tranquebarica Fabr. — Conch. Ind. t. 59. f. 3. 
169. corneovirens Pfr. — Leptaxis Tappar.-Canefri Malac. viaggio 
Mag. p. 96. 
111. Cochinchinensis Pfr. — Journ. Conch. X. 1862. t. 40. f. 4 
(non f. 3). 
173. H. Ammonia Valenciennes. 
T. sinistrorsa, angustissime umbilicata, subglobosa, tenuis, 
fragilis, pellucida, virenti-cornea, superne fortiter arcuato-plicata; 
spira brevis, convexa, obtusa; sutura subprofunda; anfr. 4 con- 
vexi, celeriter accrescentes, summi laevigati, ultimus inflatus, 
peripheria subangulatus, antice vix descendens, subtus laevior, 
circa umbilicum subcompressus; apertura diagonalis, magna, 
lunato-rotundata, intus nitidissima; perist. rectum, obtusulum, 
marginibus convergentibus, columellari sursum sensim dilatato, 
breviter reflexo. — Diam. maj. 18, min. 15'/,, alt. 13 mill. 
Helioo Ammonia Val., Pfr. Mon. VII. p. 76. 
— — Pfr. in Chemn. ed. Il. Nr. 1417. t, 169: T3929 
Habitat Bombay. (E collectione Lüdersiana.) 
* 
179. Orcula Bens. — Conch. Ind. t. 87. f. 4. 4. 
182. Calpis Bens. — Conch. Ind. t. 16. f 8. 
8. 19. 
1865. H. Stuxbergi WVesterlund. T 
«Testa perforata vel angustissime umbilicata, depresso- 
globosa, rufo-brunnea, fulvescens, nitidula, tenuis, pellucescens, 
dense transverse striata, utrinque densissime pilosa, pilis vel 
selis in striis transversalibus positis, brevibus, sursum arcuato- 
depressis; spira elata; anfr. 5—5!/5, sat forte accrescentes, 
convexiusculi, sutura profundiuscula separati, ultimus obsolete 
obtuse angulatus, medio fascia albida interdum subobsoleta 
cinctus ; apertura rotundato-lunata, peristomate simplici, vel 
intus juxta marginem late et tenui margaritacea (non tamen 
labiata), marginibus rectis, tantum columellari superne ad per- 
forationem  reflexiusculo. — Diam. maj. 9, min. S!5, alt. 6; 
apert. lat. 5, alt. & mill.» (W.) 
Helio sericea Schrenk 1867, non Drap. 
—  Stuabergi (Trichia) Agardh — Westerl. in Nachrichtsbl. 
malak. Ges. VIII. 1876. p. 98. 
Habitat in Sibiria, frequens-ad Jenissei, nec non ad Atinur. 
