THE LUSITANIAN FAUNA. 299 



other parts of the British Islands, this slug has only 

 been found in the portion of Ireland just indicated. 

 Within the last few years I have taken it, up to a 

 height of over a thousand feet, on the promontory 

 north of the Kenmare River, also from sea-level up 

 to a considerable height near Glengarirf, and more 

 recently Messrs. Praeger and Welch discovered it in 

 abundance near the town of Kenmare. But beyond 

 this rather circumscribed area in the counties of Cork 

 and Kerry it does not occur (vide Fig. 19). Several 

 Portuguese species of this interesting genus have 

 since been added to science by Dr. Simroth and 

 others. Dr. Simroth, too, has promulgated the view 

 that the genus Arion to which our common brown 

 garden slug belongs is of Lusitanian origin. Indeed, 

 the number of species of Arion diminishes as we 

 leave that province, though one extends beyond the 

 borders of Europe into Siberia. The same number of 

 species, viz. five, occur in Germany and in England. 

 Testacella a slug-like mollusc which lives under- 

 ground on earthworms, and of which genus three 

 species, viz. T. mangei, T. haliotidea, 7\ scutulum, 

 are known to inhabit the British Islands, is another 

 Lusitanian animal. All the species are confined to 

 \Vestern Europe and North Africa ; they do not even 

 reach Germany or Switzerland. 



I have had occasion to mention once before an ex- 

 tremely interesting genus of blind Woocllouse, viz., 

 Platyarthnis. Like Testacella, it lives underground, 

 and also resembles it in its general range. Its distribu- 



