298 HISTORY OF THE EUROPEAN FAUNA. 



Among our own British testaceous Land Mollusca, 

 several Helices, viz., Helix pisana, ericetorum, virgata, 

 acuta, fusca, rotundata, aculeata, and probably many 

 others, have come to us from the south-west. The 

 species of Hyalinia are undoubtedly of very remote 

 origin, and it would be futile at the present state of 

 our knowledge to speculate as to their home. Some 

 of our species may possibly be of British origin. 

 Balea perversa is probably a south-western species, 

 and certainly Pupa anglica, which is quite confined to 

 Western Europe. 



MMraraEMW^ 



FIG. 1 8. The Spotted Slug (Geomalacus maculosus}. 



Much more characteristic of South-western Europe, 

 however, than these land-shells are some of the slugs. 

 The peculiar genus Geomalacus is almost entirely 

 confined to Portugal. One species, which I have 

 had several occasions to refer to in illustration of the 

 term "discontinuous distribution," ranges far beyond 

 the confines of that country. This is Geomalacus 

 maculosus (Fig. 18), first discovered in the south- 

 west of Ireland, and more recently also in Portugal. 

 Although careful search has been made for it in 



