HELIX. 193 



H. SERTA Albers, 1854. PL 50, figs. 84, 85. 



Similar to the preceding, but less strongly striate, and with much 

 more variegated coloration ; the brown bands are narrow, very ir- 

 regular, much interrupted by patches and articulations of cream 

 color. Diam. 16, alt. 11 mill. St. Nicolas, Cape Verde Is. 



H. FOGOENSIS Dohrn, 1869. Unfigured. 



" Covered umbilicate, subglobose, striatulate, shining, corneous 

 yellow, with four brown bands, the first and second with central 

 line of white; spire obtuse, conic; suture impressed; whorls 5, con- 

 vex, the last rounded, descending anteriorly ; aperture diagonal, 

 lunate-rotund ; peristome white, slightly expanded, margins converg- 

 ing, connected by a thin callus, columella reflexed over umbilicus, 

 thickened. Diam. 17, alt. 14 mill." 



Fogo and Bmva, Cape Verde Is, 



The following quotation from Wollaston may aid in the identifi- 

 cation of the present species, which I have never seen. 



"In its rather globose outline, dull hue, and uninterrupted bands, 

 this Helix has somewhat theprimajastie aspect of the (nevertheless 

 totally dissimilar) Porto-Sanctan H. pundulata Sow.; though in 

 reality it belongs to an altogether different group. It is indeed 

 closely allied to the H. visgeriana, as is evident, not merely from 

 its general plan of coloring and from its umbilicus not being com- 

 pletely closed over, but likewise from the presence of the minute 

 spiral lines which (under a high magnifying power) are everywhere 

 visible on its surface. Specifically however, it is quite distinct, it 

 being not only larger and more globose, and of a uniformly duller 

 tint, but likewise with the minute spiral lines (which look more like 

 indistinct subundulating scratches) more irregular and obscure, and 

 with the oblique transverse costie well-nigh obsolete, and (such as 

 they are) concolorous with the rest of the surface, the entire shell 

 appearing comparatively smooth and unsculptured. Its umbilicus 

 too, is a little less closed over, and its suture is very deeply im- 

 pressed." 



H. VISGERIANA Dohrn, 1867. PI. 66, fig. 80c. 



Covered perforate or nearly so, globose depressed, shining, corne- 

 ous, with four or five narrow dark brown bands of which two are 

 below the periphery, and which are frequently interrupted by reg- 

 ular strong oblique whitish striae; revolving impressed lines visible 

 chieHv in the interstices of the striae; whorls 31, slightly convex, 

 * 13 



