HELIX. 189 



mental striae and very minutely, densely granulate ; spire low-conic ; 

 suture impressed ; whorls 5, convex, the inner gradually, the last 

 rapidly widening, slightly descending anteriorly ; aperture slightly 

 oblique, wide lunar ; peristome scarcely thickened, rather abruptly 

 shortly deflected above, ends approaching; columellar margin 

 briefly reflexed, white, impinging upon the umbilicus. 



Diam. 9, alt. 6JV mill. 



Ins. Porto Sancto. 

 More depressed than any of the preceding forms. 



H. HARTUNGI Albers, 1852. PI. 51, figs. 20-22. 



Umbilicate, subdepressed, striatulate, slightly shining, white, 

 spire subelevated, apex minute, corneous; suture smooth, whorls 

 5], slightly convex, the last wide, rotund, sensibly descending 

 anteriorly ; umbilicus narrow, pervious, equalling i the entire diam- 

 eter ; aperture oblique, depressed rotund ; peristome labiate within, 

 the margins converging, joined by a thin callus, the upper straight, 

 basal subreflexed, the columellar dilated. Diam. 10, alt. 5 mill. 



Ins. Porto Sancto. 



I have not seen this species. It is evidently nearly allied to the 

 preceding, but differs (perhaps) in the sculpture. My description 

 is from Pfeiffer. 



Section VII. LEFT-AXIS Lowe, 1852. 



Leptaxis inhabits the more outlying Atlantic islands, Madeira, 

 the Azores and the Cape Verdes. There is considerable diversity 

 of form among the species ; and this has caused a part of them to 

 be considered as belonging to Hemicycla, (a group restricted to the 

 Canary Is.) and the remainder to be divided into several subsections, 

 three of which I retain for convenience in identifying specimens. 



Katostoma Lowe, 1864, and Cryptaxis Lowe, 1864, with Lampadia 

 Lowe, 1854, ( = Mltra Albers, 1850) are synonyms. 



*** 



Lcjrftu-i* s. str. Axis imperforate ; columella entering, or ex- 

 panded at origin ; whorls not acutely carinated nor widening with 

 great rapidity. 



A. Species with rounded periphery. 



(Species of the Madeira Islands.) 

 H. UNDATA Lowe, 1831. PL 51, figs. 11, 12; pi. 52, fig. 75. 



Imperforate, depressed turbinate, rather thin, uniform dark brown 

 cely striate, but all over densely and very coarsely wrinkled, 



