4 HELIX. 



Section III. OCHTHEPHILA, Beck. 1837. 



Small, perforate or narrowly umbilicated, depressed, rounded or 

 disk-like, periphery with extremities approaching or continuous. 



Madeira, Azores. 



Subsection I. OCHTHEPHILA (sensu stricto). 



Usually scaly, granular or ribbed, last whorl keeled, periphery 

 keeled or continuous. H. ECHINULATA, Lowe. 



Hystricella, Lowe. 1854, is a synonym. 



Subsection II. GEOMITRA, Swainson. 1840. 



Shell mamilliform. H. THIARELLA, Webb, et Berth. 

 Coronaria, Lowe. 1854, is a synonym. 



Subsection III. HETEROSTOMA, Hartniann. 1844. 

 Shell planorbiform. H. OBTECTA, Lowe. 

 Spirorbula, Lowe. 1854, is a synonym. 



Subsection IV. IRUS, Lowe. 1854. 

 Shell trochiform. H. ABJECTA, Lowe. 

 Placentula, Pfr. 1855, is a synonym. 



Subsection V. PLACENTULA, Lowe. 1854. 



Shell depressed orbicular. H. MADEREXSIS, Wood. 



Section IV. ACTINELLA, Lowe. 1854. 



Narrowly umbilicated to scarcely perforate. 



Depressed globose, last whorl keeled, not descending in front, 

 aperture oblique, often with a fold-like swelling. H. COMPACTA, 

 Lowe- Madeira. 



Rimula and Caseolus (in part), Lowe and Lyrula, Wollaston, are 

 synonyms. 



Section V. TECTULA, Lowe. 1854. 



Umbilicated or perforate, depressed pyramidal, solid, roughly 

 sculptured, last whorl keeled, with a swollen inner lip. 



H. LYELLIANA, Lowe. Crenea, DePaiva (in part), is a synonyn. 



Section VI. CRASPEDARIA, Lowe. 1854. 



Widely umbilicated, pitted, the last whorl plicate at the suture, 

 spirally sculptured on the periphery and around the umbilicus, 

 descending in front to a nearly horizontal aperture, with continuous 

 expanded periphery. H. DELPHINULA, Lowe. 



