182 HELIX §.34. 



Sagda alveolata Beck ind. p. 9. (Troch. alveolatus Soland. ) 

 Habitat in insula Jamaica. 



Obs. 1. In speciminibus junioiibus fere discoideis (fornia H. Wagneri Pfr. 

 simiiibus) 2 lameliae concentricae basi conspicuae sunt. 



Obs. 2. DifTert a praecedenle praeter lamellam juniorum duplicem slalura 

 minore, anfraclibus arclioribus , costalis, apice obtuso et basi medio excavala. 



470. H. Coofciana -Gmelin. ^t75?T7'^^7!B'>t'.7>t^ 



1. nnpenorata, conoidea, leviter stnatula, laevigala, sub 

 epidermide cornea alba; spira conoidea, obtusa; anfr. 9 '/2 planius- 

 culi, ultimus subangulatus , basi profunde excavatus; columella 

 brevis, perobliqua; apertura depressa, lunaris, lamella basali in 

 fundo evanescente instructa; perist. simplex, acutum. — Diam. 

 maj. 25, min. 23, alt. 24 mill. (Coll. Nr. 271.) 

 Eelix Cookiana Gmel. 230. p. 3642. 



— — Lam. 77. p. 86. ed. Dh. p. 64. 



— — Pfr. in Zeitschr. f. 3Ial. 1845. p. 8 2. 



— — CAemn. ed. II. Helixt. 21. f. 4. 5. t. 100. f. 35 — 37. 



— epistylium Fer. hist. t. ( lOl.) 51 B. f. 4. 



— — Blainv. in Dict. sc. nat. XX. p. 438. 

 Trochus australis Chemn. IX. P. 2. p. 49. t. 122. f. 1049. 50. 

 Sagda australis Beck ind. p. 9. 



Epistylia conica Swains. Malac. p. 165. f. 18 a. 

 List.'i. 62. f. 60! (Jun.) 

 Habitat in insula Jamaica. 



Obs. \. Specimina juniora (forma H. ligerae Say) basi biiamellata. 



Obs. 2. Ab ambabus speciebus praecedentibus differt spira elevala, co- 

 nica, anfractibus arctis, laevigatis, ad suturam solummodo striatulis, et basi 

 profunde excavata. 



471. H. macrodon Menke. "^ 



T. umbilicata, depresso-globosa, tenuis, pellucida, laevis, 

 albida; anfr. 5 convexiusculi; umbilicus angustus (?) fere obtectus; 

 apertura angusta, lunato-eliiptica, intus callo lato protuberante 

 coarctata; perist. siraplex, acutum, margine columellari reflexo. 

 — Diam. maj. 17, min. I-d, alt. 10 mill. (ex ic. Fer. ) 

 Helix macrodon Mke catal. Malsb. p. 4. *) 



— Duclosiana (HeHcodonta) Fer. hist. t. 51 A. f. '6. 

 Caracollina macrodon Beck ind. p. 28. 



Habitat in Nova Hollandia (Beck). 



472. H.''bieostata^-P&.i^/'./^5^f^;.-^^''^;:' 

 T. subperforata, semiglobosa, superne subai-cucitim rQgoso- 

 slriata, nitidula, virenti-flavida; spira magis minusve elevata; 



*) T. orbiculafo-convexa , umbilicata , alba; labro interius denle crasso mu- 

 nito. (Mke 1. c.) 



