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. GEOMITEA, Swainson. 1840. 



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

 Coronaria, Lowe. 1854, is a synonym. 



Subsection III. HETEROSTOMA, Hartmanu. 1844. 

 Shell planorbiform. H. OBTECTA, Lowe. 

 Spirorbula, Lowe. 1854, is a synonym. 



Subsection IV. IRUS, Lowe. 1854. 

 Shell trochiform. H. ABJECTA, Lowe. 

 Placentida, Pfr. 1855, is a synonym. 



Subsection V. PLACENTULA, Lowe. 1854. 



Shell depressed orbicular. H. MADERENSIS, Wood. 



Section IV. ACTINELLA, Lowe. 1854. 



Narrowly umbilicated to scarcely perforate. 



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

 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. 



