CAPE-VERDE GROUP. 505 



In its rather globose outline, dull hue, and uninterrupted 

 bands, this Helix has somewhat the primd facie aspect of the 

 (nevertheless totally dissimilar) Porto-Santan H. punctulata, 

 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 colouring and from 

 its umbilicus not being completely closed over, but likewise 

 from the presence of the minute spiral lines which (under a high 

 magnifying power) are everywhere visible on its surface. Spe- 

 cifically 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 costas 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 impressed. 



The H. fogoensis was taken by myself at the Monte Nucho, 

 in Fogo ; and I also possess five examples (dead and decorticated) 

 which were met with by Mr. Lowe in Brava, namely on the 

 mountains above the Povoacao. These latter are a little less 

 globose (or more compressed), and very delicately alutaceous ; 

 and, although this may probably be due to the worn state of 

 the epidermis, I cannot detect any very decided traces of minute 

 spiral lines. Clearly, therefore, they have sufficient about them 

 to be treated as representing at all events an insular variety ; 

 and I would consequently cite them as the ; /3. bravensis.' 



Helix corneovirens. 



Helix corneovirens, Pfeiff., Mai. Bldtt. 25 (1851) 

 Id., Mon. Hel. iii. 41 (1853) 



Dohrn, Mai. Bldtt. xvi. 9 (1869) 



Morel., Journ. de Conch, xiii. 242 



(1873) 



Pfei/., Mon. Hel. vii. 75 (1876) 



Habitat S. Nicolao (sec. mus. Gaming); mihi non obvia. 

 This Helix appears to have been described by Pfeiffer from 

 a specimen, or specimens, in the collection of the late Mr. Cum- 

 in g ; but as I have not been able to obtain a sight of the type, 

 its characters (beyond what may be gathered from the published 

 diagnosis) are quite unknown to me. Although stated by Pfeiffer 

 in 1851 and 1853 to have been found in S. Nicolao, there is 

 nevertheless clearly some confusion as regards its habitat, for 

 in the 7th volume of his ' Monographia Heliceorum ' it is cited 



