— . 340 — 



3. PisiDiiiM Wàtsoni, Paiva (pi. XI, fig. 5). 



T. ovato-suhangularis, valde compressa^ tenuis^ niti- 

 dula, striis exilibus, concentrids^ irregulariter iîisculpta, 

 lutescenti-albida vel cinerascens , intus albo-fuscescens, 

 sœpe aureo-rubello nitens; latus anticum subquadrangu- 

 lare, fere truncatum, posticum rotundatum, gradatim 

 déclive, magis productum; utrumqiie distincte compressum; 

 margo inferus rotundatus; extrema obtusa, nec prominen- 

 tia; ligamentum brève, quasi inconspicuum ; axis brevis, 

 validissimus. — Longit. 4, lat. 33/4 mill. 



Hab. Haud rarum in Maderœ aquis stagnantibus. (Coll. 

 Paiva et Crosse.) 



4. ViTRiNA BocAGEi, Pai'va (pi. XI, fig. 4). 



T. helicoidea, subhaliotidiformis, parvula, subinflato- 

 depressa, succineo-pellucida, lutescenti-rubella, tenuis, 

 membranacea, nitidissima, carinata; spira subcentralis, 

 apicedepressiuscula; sutura impressa; anfr. S^penultimus 

 turgidus, amplus, albus, ultimus distincte acute carinatus, 

 carina exacte média, supra carinam transverse rugosus, 

 rugis obliquis, completis, coîicentricis, infra carinam ob- 

 soletiSj ad centrum evanescentibus ; peristoma simplex, 

 tenue, in angulum acutum medio productum. — Diam. 3-4^ 

 ait. 21/2, ax. 2 mill. 



Hab. Rarissima ad montes insulœ Maderœ sub foliis 

 emortuis. (Coll. Paiva et Crosse.) 



5. Hélix Pitt^, Paiva (pi. XI, fig. 5). 



T. perforata, globoso vel rotundato-conica, rugosa, as- 

 pera, cinereo-plumbea, granulis depressiusculis, confertis 

 aspersa; spira convexa, elatiuscula; sutura impressa; per- 



