288 Quarterly Journal of Conchology. 



plan, they cannot be considered as defining any particular 

 geographical region, but are merely species limited to a particular * 

 station in the same way as rock or marsh-loving species. 



In Amooria, according to Schrenck, 17 out of 25 species are 

 European, showing the immense diffusion of this poor fauna. 



Two districts on the southern boundaries of this region 

 deserve special mention — the Pyrenees and the Alps. The 

 Pyrenees possess many peculiar species, amongst which may be 

 mentioned Helix constricta, carascalensis and Rangiana, Pupa 

 pyrencearia, polyodon, Partioti and ringens (indeed the subgenus 

 Torquilla is largely Pyrencean) and Clausilia Pauli. Pomatias is 

 also abundant, and of many wide-spreading species there are 

 special varieties. The Alps, forming as they do the dividing line 

 between the Northern and Mediterranean regions, naturally 

 partake of the fauna of both, but the more numerous and charac- 

 teristic species are Mediterranean. 



II. THE MEDITEBBAXEAJs' BEGlOX—'^\<i'i is the 

 richest part of the Palcearctic Province, and may be considered to 

 include not only the basin of the Mediterranean itself, but that 

 of the Black Sea, except, probably, the northern shores and the 

 whole of Asia to the south of Siberia, and the west of the Indian 

 Province, except Arabia. 



Though there are many features in common, Ave consider that 

 there are certain types characteristic of the different divisions, not 

 by their exclusive limitation but by their great development. We 

 refer to Clausilia and Buliininus in the East, and Macularia and 

 Iberus in the West, and we therefore divide the region as follows : 



A, the Austro-Turkish Division, comprising the basin of the 

 Panube, the Balkan Peninsula, Asia Minor and the Caucasus ; 



B, the Italian Division, including, in addition to Italy proper, 

 the Italian Tyrol, and the Swiss Canton of Ticino ; and 



C, the Hispanc-Algeritn Division, formhig the western and 

 southern part of the region. 



