12 MOLLUSCA TERRESTRIA ET FLUVIATILIA 



lis, pellucida s. vítrea, paliide córnea v. roseo-flavescens, rarius virescens, ad 

 cariíiam faseia opaco-albida, angusta ornata, ad peripheriam albido-mannorata v. 

 punclis slrigulisque calcareis variegata, undatim s. arcuatim plicalo-rugulosa: 

 spira convexo-depressa, brevis, ápice obtusiuscula; sutura distincla; anfractus 

 4-4 Y2 convexiusculi, rapide accrescentes, ultimus inflatus, antice vix descendens, 

 superne acute angulalus; apertura ampla, transverse lunato-rotundata; perisloma 

 simplex, acutum, margiiiibus sub-conniventibus, columellari strictiusculo. — Ani- 

 mal haud timidum, facile e testa exiens, rostrum continue movens, corpore albo, 

 pellucido, dorso tenuiter oblongo-tuberculato, fronte valde prominente, auraii- 

 tiaco, rostro crasso, fere proboscideo, obtuso, sub-auranliaco, superioribus ten- 

 taculis brevibus, basi crassiusculis, ápice bulbosis, superne faseia nigra piclis, 

 inferioiibus fuscis, pede sordide albo, postice obtusiusculo, pallio sub-auran- 

 tiaco, pulposo, punctulis lividis asperso, oriflcio respiratório tubiformi. 

 Diam. maj. 10-12, min. 8-9, alt. 7-8 raill. 



Helix membranacea, Low. Syn. diagn; et Cat. moll. Mad. 

 • » Pfeif. Mon. helic. 



» » Reev. Conch. (fig. bona) 



» » Alb. Mal. Mad. (flg. bona) 



Habitat haud frequens insulae Maderae convallis Ribeiro Frio in umbrosis, 

 montiumque declivibus inter viços SM Anua et S. Jorge, juxta aquaeductum Le- 

 vada do Furado dictum sub foliis arborum emortuis super terram; raríssima 

 in Ilheo da Fonte d^Arêa prope Portosanctum insulam. 



Obs. Ab. H.-fttrvaLovie (juniore) cui valde similis, ob testam imperforatam; 

 ab W.-erubescente Lowe (juniore), quacum facile confunditur, ob spiram valde 

 depressam discernilur. 



Sectio ita denominata ob testae axis tenuitatem. 



Genus sic dictum propter testam in spiram volutam. 



Species hoc nomine designata, quod testa tenuitate membranacea certe prae- 

 dita. 



Frimus invenit clariss. Rev.** Loweus. 



á. Helix fiir\a, Lowe 



Testa (juvenis) umbilicala, (adulta) obtecte perforata, subglobosa, tenuis, 

 fusco-fasciata, sordide lulescens, superne malleato-rugulosa, epidermide umbrina 

 induta; spira ápice obtusa; sutura distincta; anfractus G subplanati, ullinius basi 

 convexiusculus, antice breviter descendens, carina fusco-fasciata v. pulcbre tes- 

 selato-maculata, júnior subangulatus; apertura vix obliqua, lunato-rotundata; pe- 



