MADEIRAN GROUP. 89 



pusilla, 0. sericina'' of Lowe), occurs, unlike the latter, in dry 

 and rocky spots of a comparatively low altitTide, — where it may 

 be met with more particularly beneath stones, on old walls, and 

 within the cavities of scoriae. In such situations it abounds 

 throughout Madeira proper, and was obtained by Mr. Lowe and 

 myself, not uncommonly, on the Deserta Grande. 



The P. pusilla is manifestly, however, a species of a widely 

 acquired range, — for it is found in the Azorean and Canarian 

 groups, and five examples of it are now before me which were 

 communicated by Dr. H. Dohrn (having been described by him 

 under the name 'i7. hypocrita ') from S. Antao in the Cape Verde 

 archipelago. I may add that I have inspected these types of 

 the hypocrita with the greatest care, and that they are abso- 

 solutely undistinguishable (so far as I can perceive) from the 

 ordinary Madeiran and Desertan specimens of the pusilla. I 

 likewise met with the species, during 1875 and 1876, in the 

 intermediate districts of even St. Helena. 



This minute Patida differs from the P. placida in being a 

 little smaller, broiuner, and more depressed (its spire being ap- 

 preciably less elevated), and in its volutions having a greater or 

 less tendency to be furnished with a few additional, remote, 

 more decidedly raised, hair-like lines, which are occasionally 

 so much developed as to be quite conspicuous, and even to ap- 

 pear (at first sight) almost lamelliform. These thread-like 

 lines, however, are more often so indistinct that they can be 

 observed only beneath a high magnifying power. 



Genus 7. HELIX, Linne. 



(§ Vallonia, Kisso.) 



Helix pulchella. 



Helix pulchella, 31iill., Hist. Verm. ii. 30 (1774) 



„ „ Lowe., Canibr. Phil. S. Trans, iv. 45 (1831) 



„ „ Id.^ Proc. Zool. Soc. Lond. 176 (1854) 



„ „ Alb., Mai. Mad. 45. t. 12. f. 1-4 (1854) 



„ Paiva, Mon. Moll. 3Iacl. 77 {1867) 



„ „ Mouss., Faun. Mai. des Can. 75 (1872) 



„ „ Watson, Journ. de Conch. 222 (1876) 



Habitat Maderam, et (sec. B. de Paiva) etiam Desertam 

 Australem ; hinc inde sub lapidibus, prsecipue in cultis. 



This widely spread little Helix, so common throughout 

 Europe, and which occurs also in the Azorean and Canarian 

 archipelagos, and which I met with at St. Helena, and which 

 was taken by Mr. Benson even at the Cape of Good Hope, is 

 tolerably abundant around Funchal (and in similar cultivated 



