[NSULARUM MADERENSIUM 



63 



su!a transhita, quoniam in insulis Ganariensibus hodie recentia, fossilia non re- 

 perla. 



Species sic dicta qiiòd testa spirae conformatione Summi Pontificis Romani 

 liaram qiiodammodo refert. 



Species pulchra et ab affinibus distinctissima. 



In insula Madera invenit primiis clariss. Webb.? 



Recentem primi invenerual in Madera clariss. Rev.'' Loweus et Wollastoniis 

 annu 1835. 



37. Hcli\ cftrouula, Lowe 



iTab. 2, fig. 2) 



(recens) 



Tesla umbilicala, corivexo-depressa, subdiscoidea, fuscescens, sordide alba 

 s. opaco-cretacea ; spira convexiuscula, coronata, apice planata; sutura impressa; 

 umbilicus patuius, profundus, pervius; anfractus 3-3 72. superiores duo angu- 

 lato-pianali, caelcri fere scalares, medio reclangulati, supra slrigis coroiiati, ra- 

 diatim foveolati, tuberculalo-plicati, ultimus costis lineisque regulariter decussa- 

 tus, subi)icarinntus, aiilice deilexus; apertura rotundata v. subtriangularis, con- 

 stricta, crenulala; peristoma continuam, undique soiutum, subsinuato-expansum. 

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

 cuKs, nigrescenlibus, plus rainus rotundalis asperso, dorso castaneo-fuscescente, 

 fronte convexo, fusco-maculalo, medio transverse depresso, subproboscideo, cas- 

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

 piumbeis, apice rotundo-bulbosis, inferioribus gracilibus, fere lanceolatis, plum- 

 l)eis, pede aibido, poslice rotundato, antice subbilido, pallio iacteo, punctuMs fus- 

 cis marmorato, exserto, orilicio respiratório spbinctere semilunari, albo, crasso 

 instructo. 



Diam. maj. 7, rain. 3, alt. 3 '/2 miil. 



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

 » » Pfeif. Mon. helic. 



» » Alb. Mal. Mad. (fig. óptima) 



» .) Pfeif. Mal. BI. Marz. 18G4 (íig. óptima) 



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

 pium maritimarum fissuris. 



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

 piose in summo jugo insulae Desertas Australis reperitur. 



