34 TEST ACE A ATLANTIC A. 



( Sjrirobula, Lowe.) 



Helix paupercula, 



Helix paupercula, Lowe, Cambr. Phil. S. Trans, iv. 47. t. 5. 



f. 19 (1831) 

 Pfeiff., Man. Hel. i. 189 (1848) 



Alb., Mai. Mad. 35. t. 8. f. 27-30 (1854) 



Morel, Hist. Nat. des Acor. 175 (1860) 



Drouet, Faun. Acor. 157 (1861) 



Mouss., Faun. Mai. des Can. 60 (1872) 



Habitat S. Miguel, Fayal, et Pico ; in aridis apricis infe- 

 rioribus submaratimis, hinc inde ad rupes adhaerens necnon sub 

 lapidibus. 



The curious little H. paupercula, which occurs on the whole 

 five islands of the Madeiran Group (where it is manifestly abori- 

 ginal), and which exists likewise (though sparingly) in the 

 eastern part of the Canarian archipelago, has been detected (at 

 the Azores) in S. Miguel, Fayal, and Pico, where it is found, 

 as in the Madeiras, in dry and rocky places near the coast. 

 Whether it has been naturalized accidentally from the more 

 southern Group, or whether the Azores constitute a portion of 

 its primevally-acquired range, is a problem which it is scarcely 

 possible to solve. 



The small size, and flattened, planorbiform outline of this 

 obscurely-coloured, solid little Helix (which has the singular 

 habit of cementing itself over, more or less, with a hardened 

 covering of mud), in conjunction with its whorls being only 

 about four in number, its basal region inflated and convex, 

 its umbilicus large, deep, and spiral, and its aperture (which is 

 a good deal deflexed) powerfully constricted behind, so as to 

 shape out an annular ridge-like prominence, whilst the peri- 

 stome itself is comparatively thin, well-nigh circular, and ele- 

 vated, will readily distinguish it. Its average width, across the 

 broadest part, is about 2^ lines. 



( His2)idella, Lowe.) 



Helix horripila. 



Helix horripila, Morel, et Dr., Journ. de Conch, vi. 149 



(1857) 

 Mouss., Viert. der Nat. Zurich, 165 



(1858) 



Pfeiff., Mon. Hel. iv. 303 (1859) 



Morel., Hist. Nat. des Acor. 170. t. 3. f. 3 



(1860) 

 Drouet, Faun. Acor. 154 (1861) 



