HELIX. 199 



vox above, acutely carinated, briefly deflexed anteriorly ; base some- 

 what convex, not indented in the center; aperture very oblique, 

 slightly broader than long, truncate oval ; peristome labiate inside, 

 pink-tinted, its terminations not converging ; columellar margin 

 thickened, somewhat flattened, appressed ; parietal wall covered by 

 a pinkish callus. Diam. 15-19, alt. 11-12 mill. 



Quarternary of Sta. Maria, Azores. 



This species seems to most nearly allied to the H. chrysomela of 

 Porto Sancto, but may be readily seperated by its sculpture, large 

 size, conical spire and acute peripheral carina. 



H. AVOLLASTONI Lowe, 1852. PI. 51, figs. 59-60. 



Imperforate, depressed conic, rather solid, carinate, dark yellowish 

 or olivaceous-brown, with, usually, two spiral darker bauds ; oblique- 

 ly plicate-striite, and covered with a minute granulation ; spire usu- 

 ally depressed, the apical whorl smooth ; whorls 5, nearly planulate 

 the last 2 rapidly widening ; body-whorl acutely carinated, deeply 

 descending anteriorly; base convex, not indented at the center; 

 aperture transversely oval, angular at the extremities, very oblique ; 

 peristome a little expanded, usually pinkish, nearly continuous over 

 the parietal wall; columella somewhat dilated, flattened, entering. 



Diam. 22, alt, 11 mill. 



Ins. Porto Sancto. 



Probably more nearly allied to H. nivosa than to the species with 

 which on account of its carinate periphery, it is here associated. 



Var. FOKKXSIS \Vollaston. 



A smaller form than the type, in which the aperture is rounded 

 at the outer margin, scarcely modified by the peripheral keel; the 

 parietal wall is traversed by a very heavy callus which joins the lips; 

 and the inner two or three whorls of the spire usually are prominent, 

 as if mamillated. Diam. 17, alt. 9 mill. 



Described as a species by Mr. Wollaston, but the specimens before 

 me are too similar to wollastoni to be separated. 



V 



2. Psetidocampylcea Pfr. Axis umbilicate ; aperture oval, the lips 

 expanded, converging. 



H. rouTOSANCTANA Sowerby, 1824. PL 52, figs. 87-89. 



[Jmbilicate, depressed, rather strong, corneous yellow, with three 

 brown bauds, the upper two generally broad, often coalescent ; sur- 

 face marked with rather strong, irregular incremental wrinkles, all 



