THE ORIENTAL MIGRATION. 



South Sweden, Germany, France, and Spain. It is 

 also known from North Africa and from Madeira, the 

 Canaries, and the Salvages. The occurrence of the 

 Tree-Frog an so many of the Mediterranean islands 

 is of particular interest, especially as four well-marked 

 varieties have been distinguished by our leading her- 

 petologists, so that the more minute features of the 

 various forms can be traced from island to island, 

 adding one more proof if proof were needed of 

 their former continuity. Of course, that Hyla arborea 

 must be considered an Oriental migrant seems so 

 evident that it scarcely needs further comment. 



A number of mollusca might be mentioned whose 

 range indicates that they have migrated to Europe 

 from Asia Minor. Buliminus pupa is one of these. 

 It is known from Asia Minor, Greece, South Italy, 

 Sicily, and Algeria. Buliminus detritus is perhaps 

 better known, being common in some parts of 

 Germany. From there its range spreads east as 

 far as Asia Minor. Many closely allied species 

 inhabit Western Asia, to which they are confined, 

 while others enter on European territory in some 

 of the Greek islands. B. fasciolatus occurs on the 

 islands of Crete, Rhodes, Cyprus, and in Greece 

 and Syria. Most of the species of Buliminus have 

 a very restricted range, but Buliminus obscurus is 

 found almost all over Europe, from Ireland in the 

 west to the Crimea and Transcaucasia in the east. 



Whether the sub-genus Pomatia of the genus 

 Helix to which the so-called Roman Snail belongs 



