122 TEST ACE A ATLANTIC A. 



from about 4 to 4^ lines) displays much the same type of 

 colouriug as the broadly bifasciated state of the H. vulgata ; 

 nevertheless its two bands are usually very wide, and frequently 

 subcoufluent, — so as to cause nearly the whole upper surface 

 (except a few detached, transverse, irregular, somewhat line-like 

 but broken-up, white fragments, across the fasciie) to be dark 

 bro'svn, the umbilical area alone showing a ground-hue of a 

 dusky yellowish- white. The character of its aperture, however, 

 which is comparatively cii'cidar, the peristome being raised and 

 continuous across the body-volution, throws it into a different 

 section from that species ; the entire shell is a little less globose 

 (or more lenticular) than the H. vulgata, the whorls are rather 

 prominent and subangular, and the whole surface is not only 

 roughly sculptured with very coarse and irregular transverse ' 

 curved subfluent cost^e, but more or less clothed, when the spe- 

 cimens are fresh and unruhhed, with small fragile membrane- 

 ous lacinise. 



Helix depauperata. 



Helix depauperata, Loive, Cambr. Phil. S. Trans, iv. 51. 

 „ „ Pfeif., Mon. Hel. i. 166 (1848) 



„ „ Lotue, Proc. Zool. Soc. Lond. 174 



(1854) 

 „ „ Alb., Mai. Mad. 32. t. 8. f. 9-12 



(1854) 

 „ „ Paiva, Mon. Moll. Mad. 57 (1867) 



Habitat Portum Sanctum, insulasque parvas adjacentas ; et 

 recens et semifossilis, vulgaris. 



This is one of the most general, and widely spread, of the 

 Helices of Porto Santo, to which island (and the immediately 

 adjacent rocks) it is peculiar, — occurring abundantly both in a 

 recent and subfossil condition ; and it may be regarded perhaps 

 as the Poito-Santan representative of the H. squalida of 

 Madeira. 



The H. depauperata is a rather insignificant Helix, either 

 of a uniformly pale brown or of a dingy brownish-white, rather 

 rounded (but not globose) in outline, with a distinct umbilicus, 

 and with its surface (which is opake) very minutely and deli- 

 cately granulated, but at the same time much roughened with 

 coarse transverse folds, — which are so exceedingly irregular and 

 subcoufluent as to cause the shell to appear well-nigh subraal- 

 leate. Its apertiu-e is not quite so continuous as in the H. laci- 

 niosa, nevertheless its upper and lower portions are joined 

 across the body volution by a corneous lamina so cousf)icuous as 

 to make it appear almost circular. 



