182 IIELIX §. 34. 



ScKjda alveolala Beck ind. p. 9. (Troch. alvcolatus Soland. ) 

 Habital in insula Jamaica. 



Obs. 1. Iii spocimimljiis junioiihns foro discoideis (forma H. Wagneri Pfr 

 similibus) 2 lamellae conccntricae basi conspicuao suiU. 



Obs. 2. Dirferl a praocedenle praotcr lamellam juniorum duplicein staluia 

 minore, anfraclibus arclioribus, coslatis , apice obluso ct basi medio excavala. 



470. H. Cookiana Gmelin. 



T. iinperforata, conoidea, leviler striatula, laevigata, 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. — Diain. 

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

 Helix Cookiana Gmel. 230. p. 3642. 



— — Lam. 77. p. 80. ed. Dh. p. 64. 



— — Pfr. in Zeitschr. f. Mal. 1845. p. 82. 



— — Cliemfi. ed. II. Helix t. 21. f. 4. 3. t. 100. f. 35 — 37. 



— epistylium Fer. hist. t. ( 101.) 51 B. f. 4. 



— — Blainv. in Dict. sc. nat. XX. p. 43 8. 

 Trochus australis Chemn. IX. P. 2. p. 49. t. 122. f. 10 49. 50. 

 Sagda australis Beck ind. p. 9. 



Epistylia conica Swains. Malac. p. 103. f 18 a. 

 List. \. 62. f. 60! (Jun.) 

 llabitat in insula Jamaica. 



Obs. 1. Specimina juniora (forma H. iigerae Say) basi biiameilala. 



Obs. 2. Ab ambabus speciebus praocodenlibus dilferl spira eievata, co- 

 nica , anfractiljus arctis, laevigalis , ad suturam solummodo slriatulis, el 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-elliptica, intus callo lato protuberante 

 coarctata; perist. simplex, acutura, margine columellari reflexo. 

 — Diam. maj. 17, niin. 15, alt. 10 mill. (ex ic. Fer. ) 

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



— Dnclosiana (Ilelicodonta) Fer. hist. t. 51 A. f. G. 

 Caracollina macrodon Beck ind. p. 28. 



Ilabitat in Nova Ilollandia (Beck). 



472. H. bicostata Pfr. 



T. subperforata, semiglobosa, superne subarcuatim rugoso- 

 slriala, nitidula, virenti-flavida; spira magis minusve clevata; 



*) T. orbiculafo-convoxa , umbilicala, alba; labro inlcrius donle crasso mu- 

 nito (Mke 1. c.) 



