182 
HELIX §. 34. 
Sagda alveolata Beck ind. p. 9. (Troch. alveolatus Soland.) 
Habitat in insula Jamaica. 
Obs. I. In specimmibus junioribus fero cliscoideis (forma II. Wagneri Pfr. 
similibus) 2 lamellae concoulricae basi conspicuae sunt. 
Obs. 2. Dilfert a praecedente praeter lamellam juniorum duplicem statura 
minore, anfractibus arctioribus, co.siaUs, apice obluso et basi medio excavata. 
^ 470. H. CooMana Gmclin. 
T. imperforata, conoideo, leviter strialula, lacvigata, 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, ^utum. — Diam, 
maj. 25, rain. 23, ait. 24 mill. (Coli. Nr. 27!.) 
Helix Cookiana GmeL 230. p. 3642. 
— — Lam. 77. p. 80. ed. Dh. p. 64. 
— — Pfr. in Zeilschr. f. Mal. !843. p. 82. 
— — Chemn. ed. U.HelLx t. 21. f. 4. 5. t. 100. f. 33 — 37. 
— epistylium Fdr. hist. t. ( 101.) 5t B. f. 4. 
— — Blainv. in Dict. sc. nat XX. p. 438. 
Trochus austi'alis Chemn. IX. P. 2. p. 49. i. 122. f. 1049. 50. 
Sagda australis Beck ind. p. 9. 
Epistylia conica Swains. Malae, p. 165. f. 18 a. 
List.\. 62. f. 60! (Jun.) 
Habitat in insula Jamaica. 
Obs. 1. Specimina juniora (forma H. ligerae Say) basi bilamellata. 
Obs. 2. Ab ambabus spcciebus praecedentibus dilfert spira elevata, co- 
nica, anfractibus arctis, laevigatis, ad suturam solummodo slriatulis , et basi 
profunde excavata. 
471- H. macrodon Menke, 
T. umbilicata, depresso-globosa, tenuis, pellucida, laevis, 
albida; anfr. 3 convexiusculi; umbilicus angustas (?) fere obtectus; 
apertura angusta, lunato -elliptica, intus callo lato protuberante 
coarctata; perist. simplex, acutum, margine columellari reflexo. 
— Diam. maj. 17, rain. 15, ait. 10 raili. (ex ic. Fer.)^ 
Helix macrodon Mke catal. Malsb. p. 4. *) 
— Duclosiana (Helicodonta) Fer. hist. t. 51 .4. f. 6. 
Caracollina macrodon Beck ind. p. 28. 
Habitat in Nova Ilollandia (Beck). 
^ 472. H. bicostata Pfr. 
T. subperforata, semiglobosa, superne subarcuatim rugoso - 
striata, nitidula, virenti- flavida; spira magis minusve elevata; 
*) T. orbiculalo-convexa , umbilicata, alba; labro interius dente crasso mu- 
nito. (Mke I. c.) 
