170 TEST ACE A ATLANTIC A. 



connected margins of its peristome it has more in common with 

 the latter than with the former. 1 



f. lincta, Lowe. 



Helix polymorpha, /3. depressiuscula, Lowe, I. c. 54. t. 6. f. 



13 (1831) 

 „ „ g. Pfeiff., Mai. BlaU.%\ (1852) 



„ lincta, Lowe, Ann. Nat. Hist. ix. 116 (1852) 

 „ „ Id., Proc. Zool. Soc. Loud. 189 (1854) 

 „ polymorpha, var. s., Alb., I. c. 26. t. 5. f. 21-23 (1854) 

 „ „ var. 7., Paiva, I.e. 85 (1867) 



Habitat Maderam ; in collibns apricis maritimis hand longe 

 ab nrbe Funchalensi, sc. ad et versus promontorium Garajao 

 dictum, copiossime sub lapidibus. 



This is the common modification of the H. polymoijjha on 

 the dry, sunny, maritime hills and cliffs to the eastward of Fun- 

 chal, — towards, and around, the Cabo Garajao (or Brazen Head). 

 It may be known by its keel being somewhat blunt or obtuse, 

 and its underside slightly shining and comparatively free from 

 sculpture, — the lines being very light, and the granules nearly 

 evanescent. Its upper region however has the granules coarser, 

 though rather wide apart. In colour it is generally of a clear 

 yellowish-white beneath, with a distinct band encircling the um- 

 bilical area, and another, usually broken-up and more or less 

 fragmentary (sometime obsolete), between that and the keel ; 

 whilst above it is dappled, or dingily variegated, with whitish 

 and brownish irregular transverse markings, the region outside the 

 aperture (which has the margins of its peristome wide apart, and 

 scarcely connected across the body-volution by a thin corneous 

 lamina) being gradually paler. 



97. arenicola, Lowe. 



Helix polymorpha, 7. arenicola, Lowe, I. c. 54. t. 6. f. 13. 



(1831) 

 „ „ £, Pfeiff., Mai. Bldtt. 81 (1852) 



., lincta, var. /?. cinerea, Lowe, Proc. Zool. Soc. Lond. 



190 (1854) 

 „ polymorpha, var. £., Alb., I. c. 26. t. 5. f. 24, 25 (1854) 

 „ „ var. 7. cinerea, Paiva, I. c. 85 (1867) 



Habitat Maderam ; in aridis calcareis arenosis, proesertim 



1 The Baron Paiva speaks of the ' e. A lleniana ' as subfossilized in the 

 Ribeirade Sao Jorge ; but I suspect that he must allule in reality to dead and 

 decorticated examples (of which I possess several from Sta. Anna), — for I am 

 not aware that there is any strictly svtbfossil deposit in the S. Jorge ravine. 



