HELIX 50. 
231 
§• 50. 
010. H. opalxna Sowerby. 
T. imperforata, pyramidalis, apico obtusa, tenuis, hyalina, 
viresceoli-albida, laevis, nitida; sutura linearis, albo-niarginata; 
anfr. 6 plani, ultimus obtuso carinatus; columella tenuis, arcuata, 
subdentata, sulco obsoleto circumdata; apertura perobliqua, lu- 
nato- subcircularis; perist. simplex, vix cx{)ansum. — Diam. inaj. 
21 , min. 19, ait. 25 mill. (Coli. Nr. 357.) 
Helix opalina Sow, in Proc. Zool. Soc. 1840. n. 98. 
— — Pfr. Symb. II. p. 33. 
— — Cheinn, cd. II. Helix N. 28 1. t. 49. f. 6. 7. 
Habitat in provincia Cagayan insulae Luzon (Cuming). 
611. H. Fcrussaci Lesson. 
T. imperforata, trochiformis, saturate castanea, fascia aurea 
usque ad apicem ornata, basi plana, acute carinata; spira conica; 
anfr. 6 plani; sutura levissima; apertura depressa, triangularis; 
perist. marginatum, reflexum, sinuosum. — Diam. 11 liu., all. 
I poli. (L.) 
Helix Ferussaci Less. voy. de la Co((. Zool. II. p. 315. l. 8. f. 5. 
Geolrochus Ferussaci Beck ind. p. 47. 
— — Swains, 51alac. p. 332. 
(JarocoUa pileus Mke syn. ed. II. p. 23? 
Habitat in Nova Guinea. 
'a 
Obs. An modo vai*. acutius carinata II. pilei? Sed imperforata dicitur. 
612. U. Gaberti Lcsson. 
T. imperforata, conoidea, lineis obliquis minutissime sul>- 
decussata, pallide flavescens, strigis undatis et flammis fuscis 
picta; sutura impressa; anfr. 6 planiusculi, ultimus basi angula- 
tus; columella obliqua, dilatata, superne incrassata; apertura sub- 
horizontalis, lunato-eiliplica ; pcM*ist. late expansum, album, mar- 
ginibus approximatis. — Diam. inaj. 26, min, 20, ait. 22 piilL 
(Mus. Cuming.) 
Helix Gaberli Less. voy. de la Coq. II. p. 314. 
— trochus Quoy et Gaim. Aslrol. II. p. lOQi t. 8. f. 5 — 7. 
— trochoides Lam. ed. DIi. 197. p. 122. 
— .... Fer. hist. t. 106. f. 10 — 12. 
Habitat in Nova Guinea (Quoy), Nova Hibernia. 
613. H. rhombostoma Pfr. 
T. imperforata, trochiformis, tenuiuscula, oblique slriatula, 
lineis confertissimis concentricis subdccussala, nilidula, albido- 
