HELIX. 191 



ture very oblique, rounded oval ; peristome simple, the terminations- 

 converging, the upper extended into a white callus, columellar 

 dilated, straightened inside, pinkish. Diam. 15, alt. 12 mill. 



Ins. Porto Sancto- 

 H. phlebophora Lowe and H. exalbida Wood are synonyms. 



Var. CRATICULATA Lowe. 



Smaller than the type, and darker, with very coarse corrugations- 

 There is also a depressed form (,3. planata Lowe) in which the 



body whorl is frequently car mate at its origin. 



H. PSAMMOPHORA Lowe, 1852. PI. 51, fig. 32. 



Imperforate, turbinate-conic, destitute of cuticle or color, elegantly 

 sculptured with irregular incremental wrinkles cut into rounded 

 granules by fine and very numerous spiral impressed lines; last 

 whorl very deeply detlexed anteriorly ; aperture small, very oblique,, 

 rounded oval. Diam. 12, alt. 10 mill. 



Quaternary of Ins. Porto Sancto. 



Allied to the preceding, but distinguished from that and all other 

 forms by the peculiar sculpture. The revolving lines are not suf- 

 ficiently shown in the figure. 



H. ERUBESCENS Lowe, 1831. PI. 52, figs. 81-83. 



Imperforate, globose, elevated or depressed, rather thin, whitisk 

 corneous, with oblique streaks of clear corneous, and usually spiral 

 bands or series of blotches of rich dark brown; sculptured with 

 incremental wrinkles and oblique anastomosing currugations; spire 

 conic, elevated or depressed; whorls 5, slightly convex, the last 

 convex below, indented at the center and descending anteriorly* 

 aperture oval or rounded truncate, very oblique; peristome expanded, 

 labiate with white; columella inserted nearly vertically, simple; 

 umbilical tract covered by a white callus. 



Diam. 14, alt. 10-14 mill. Madeira Is.; St. Miguel, Azores- 



H. simia Fer., (pi. 51, fig. 28) is synonymous. 



This species may be known under all its forms by the simple,, 

 thin deeply entering columella. 



"The II. erubescens passes through an almost infinite number of 

 changes both in outline and hue, as regards the latter scarcely two> 

 specimens being precisely alike. Sometimes the volutions are 

 elegantly banded, at others some of the fascia? are obsolete, and at 

 others the latter are more or less broken up into tessellated frag- 

 ments; while many individuals are concolorous, being entirely 

 devoid of markings. The ground-color varies chiefly from a pale 



