30 TEST ACE A ATLANTIC A. 



can only hope therefore that this is trnly the case, and that in 

 ri'ij 'isfrriii;/ it as universal it is strictly in accordance with 

 facts. 1 



Helix lenticula. 



Helix lenticula, Fer., Tabl. Syst. 37, 154 (1821) 



„ subtilis, Lowe, Cambr. Phil. 8. Trans, iv. 45. t. 5. 

 f. 13(1831) 

 lenticula, Id., Prod. Zool. Soc. Load. 196 (1854) 



Jib., Mai. Mad. 43. t, 11. f. 9-12(1854) 

 Morel., Hist Nat. des Acor. 169 (1860) 

 Drouet, Faun. Acor. 156 (1861) 

 Mouss., Faun. Mai. des Can. 66 (1872) 



Habitat Sta. Maria, S. Miguel, et Pico: sub lapidibus in 

 aridis, rarior. 



The South-European H. lenticula, Fer., appears to occur 

 sparingly in Sta. Maria, S. Miguel, and Pico ; but it was not 

 observed, by either Morelet or Drouet, in any of the other 

 islands. It seems to be found under stones at the base of walls, 

 as well as amongst the plants of Agave americana (or American 

 Aloe), in dry spots of a low altitude. It is common in the 

 Madeiran and Canarian archipelagos, but less so at the Cape 

 Verdes. 



(§ Lem niacin, Lowe.) 



Helix vespertina. 



Helix vespertina, Morel., Hist. Nat. des Acov. 170. t. 3. f. 3 



(1860) 

 „ „ Drouet, Faun. Acor. 154 (1861) 



Habitat Terceira : in montibus juxta craterem magnum 

 Caldeirao dictum parce reperta. 



The affinities of this rather insignificant little Helix seem to 

 me to be very dubious ; and, unfortunately, Morelet gives us no 

 clue as to its nearest allies. Judging however from his diag- 

 nosis and very excellent figure, I am inclined to think that it 

 may perhaps have something in common with the Canarian 

 species (of Lowe's section Lemniscia) around the H. Wood- 

 war dia of Tarnier and the ccerneniitia of Shuttleworth ; and I 

 would therefore cite it accordingly, though at the same time 

 not without considerable hesitation. It is only in the island of 

 Terceira that it has hitherto been met with, where it was found 



1 The H. barbula- is well distinguished from the lenticvla by (inter alia) 

 its comparatively gigantic size (the larger examples measuring about 5^ lines 

 across their broadest part), its more numerous volutions, its more strongly 

 costate surface, and by its incrassated peristome, — the columellary and basal 

 margins of which are much more recurved, as well as armed internally with 

 two obtuse, but unequal, tooth-like callosities. 



