AZOREAN GROUP. 31 



comparatively few years ago, but I have no evidence that it has 

 succeeded in establishing itself to any appreciable extent ; but 

 in Palma of the Canarian Grroup it has gained a complete foot- 

 ing, and, since it assumes there a slightly local aspect, there is 

 reason to suspect that it may have existed in that island for at 

 all events a considerable period. 



(§ Macularia, Alb.) 



Helix lactea. 



Helix lactea, Miill., Verm. Hist. ii. 19 (1774) 

 „ „ W. et B., Ann. des Sc. Nat. 28. Syn. 313 



(1833) 

 „ „ crOrh., in W. et B. Hist. ii. 2. 55 (1839) 

 „ „ lIoreL, Hist. Nat. des Agor. 152 (1860) 

 „ „ Brouet, Faun. Agor. 150 (1861) 

 „ „ 3Iouss., Faun. Mai. des Can. 70 (1872) 



Habitat Sta. Maria, et S. Miguel; in inferioribus, sed baud 

 abundans. 



The Mediterranean H. lactea, which is found in the Canarian 

 Grroup, and is very abundant on the coast of Morocco, occurs 

 sparingly around Ponta Delgada in S. Miguel, as well as in a 

 calcareous district in the south of Sta. Maria. Morelet, who 

 remarks that the Azorean examples are very similar to those of 

 Portugal, is of opinion that it has probably been imported into 

 the islands. 



(§ EiqJaryjjJia, Hartm.) 



Helix pisana. 



Helix pisana, MillL, Verm. Hist. ii. 60 (1774) 



„ „ Lowe, Gambr. Phil. S. Trans, iv. 52 (1831) 

 „ „ Alb., Mai. Mad. 21. t. 3. f. 1—18 (1854) 

 „ „ Morel, Hist. Nat. des Agor. 153 (1860) 

 „ „ Drouet, Faun. Agor. 150 (1861) 

 „ „ Mouss., Faun. Mai. des Can. 28 (1872) 



Habitat ins. omnes (sec. Morelet et Drouet) ; in inferioribus, 

 prsecipue cultis, vulgaris. 



By both Morelet and Drouet the common 'Europeaji H. pisana 

 is said to occur on every island of the Azorean archipelago, — 

 abounding in gardens, and other cultivated spots. It is locally 

 plentiful in the Madeiran and Canarian Groups ; and in the 

 latter, as well as on the intermediate isolated rocks of the 

 Salvages, it is developed into several very beautiful and well- 

 defined varieties. Hitherto, however, it has not been observed 

 at the Cape Verdes. 



