mSULARUM MADERENSIUM 63 



sula translata, quoniam ia insulis Canariensibus hodie recentia, fossilia non re- 

 perla. 



Species sic dieta qiiòd testa spirae conformatione Summi Pontificis Romani 

 liaram qiiodammodo refert. 



Species piílchra et ah aíTiiiibus distinctissima. 



In insula Madera invenit primus ciariss. Weiíb.? 



Recentem prinii inveneruíil in Madera ciariss. Rev.'' Loweus et Wollastonus 

 anno 1855. 



37. Helix coionula, Lowe 



(Tab. '■2, llg. -2) 



(recens) 



Testa umbilicata, convexo-depressa, subdiscoidea, fuscescens, sordide alba 

 s. opaco-cretacea: spira convexiiíscida, coronata, ápice planata; sutura impressa; 

 umbilicus patukis, profundus, pervius; anfractus 5-5 '/a, superiuies duo angu- 

 lato-pianati, caeteri fere scalares, médio reclangulati, supra slrigis coronati, ra- 

 diaíim foveoiati, tuberculalo-plicati. ullimus costis lineisque regulariler decussa- 

 tus, subbicarinatus, antice dellexus; apertura rotundata v. subtriangularis, con- 

 stricta, crenulata; peristoma continuam, undique solutum, subsinuato-expansum. 

 —Animal non timidum, nec tardum, corpore albido, pellucido, minutis tuber- 

 culis, nigresccntibus, plus minus rotundatis asperso, dorso castaneo-fuscescente, 

 fronte convexo, fusco-raaculalo, médio transverse depresso, subpi'oboscideo, cas- 

 taneo-mamillato, superioribus tenlaculis mediocribus, cyíindricis, crassis, supra 

 plumbeis, ápice rolundo-bulbosis, iiiferioribus gracilibus, fere ianceolatis, plum- 

 i)eis, pede albido, postice rotundalo, antice subbilido, pallio lácteo, punctulis fus- 

 cis marmorato, exserto, orificio respiratório sphinclere semilunari, albo, crasso 

 instructo. 



Diam. maj. 7, min. 5, alt. 3 ' 2 mill. 



Helix coronula, Low. Syn. Diagn.; et Cat. moll. Mad. 

 » » Pfeif. Mon. helic. 



» » Alb. Mal. Mad. (fig. oplimaj 



» » Pfeif. Mal. BI. Marz. 1864 (fig. óptima) 



Habitat liaud rara in insula Deserta Majore sub lichenibus latens in ru- 

 pium marilimarum flssuris. 



Statu semifossili v. saltem emortuo, testa minore, omnino decolorata, co- 

 piose in summo jugo insulae Desertae Australis reperitur. 



