INSULARUM MADEP.ENSIUM 



153 



tura subsemicircularis v. ellipsoidea, ringens, plica parietali magna, lamellao- 

 formi, spiraliler intranle ciim (lenlihus Í2 in labio columellari plano sita, instriicla : 

 peristoma inUis cailosum v. clentaluni, margine acuto.— Animal Melampoduin 

 simile, nisi pede duplici, in partes duas transversali sulco distinctas diviso, anle- 

 riorem qunm lalam longiorcm, transversam, antice rotundatam, posteiiorem ma- 

 jorem, antice Iruncatam, postice suhattenualam, obtnsam, brevem, semiovalem. 

 Habitat copiosissime sub lapidibus in Africae, Americae australis, Indiae Oc- 

 cidentalis, oceani Atlanlici insularuni mai-itimis, cum Truncatellis, Marinulis so- 

 cialis. 



redipos afer, Gmelin 



Testa imperforata, ovalo-conica, ventricosa, solida, lineis impressis, spirali- 

 l)us confertim sculpta, pallide fulva; spira conoidea, brevis, apice acutiuscula; 

 sutura distincta; anfractus 4 72-3 convexi, lente accrescentes, inaequales, ulti- 

 mus -/3 longitudinis aequans, basi rotundatus; apertura fere diagonalis, subse- 

 micircularis, quinquedentata, plica parietatis 1 valida, linguaeformi, spiraliter' 

 prope dextri marginis insertionem inlrante, dentibus 2 acutis, aeijualibus, in co- 

 lumellae planatae, albae, nitidae interno margine sitis; peristoma acutum, dex- 

 tro myi'ginis in médio plica I transvei'sa, elongata, aUeraque minore supra illam 

 munilo. — Animal noii limidum, corpore albido-corneo, fronte sublutescenlc.i^o- 

 stro bipartito, tentaculis brevissimis, violaceis, conicis, apice globosis, oculis ro- 

 tundatis, pede sordide albo, pallio pulposo, albido, orifício respiratório obliquo 

 elliptico. 



Long. G-7, lat. max. G '/2, ap. 473 mill. longa. 



Pedipes Adans. Hist. Seneg. 

 Helix afra, Gm. Syst. 

 Pedipes » Fèr. Prodr. 



» » Low. in Zool. Journ. ; et Cat. moll. Mad. 



» afei-, Pfeif. Monogr. Aur. 



Habitat frequens in Africae arenosis maritimis sub lapidibus in índia Occi- 

 dentali, circa insulam Gorèe ad fluvium Senegal, Gambia; ad promontorium Ma- 

 derae S. Lourenço, Pontinha prope Funchal, Gorgulho, ad insulam Selvagem 

 Majoremj cum Truncatellis, Marinulis, etc. sodadis. 



Obs. Testae magnitudine variat pliirinunn, duplo-triplo majore v. minore. 



Genus ita denominatum propter pedem in partes duas distinctas divi- 

 sum. 



Species sic dieta a regione ubi indígena primúm reperta. 



In Madera primus invenit clariss. Rev.'' Loweus. 



20 



