LUSITAJflAN KEG ION. 



91 



BithjTiia Kickxii, R. Ami, Altai. 

 Valvata cristata, var. Sibirica, Bernaul, 

 Beresov ; Kamtschatka. 

 „ piscinalis, R. Ami. 

 Unio complanatus Kamtschatka. 

 „ Dahiisicus, Mid. Schilka. 

 „ Mongolicus, M. Gorbitza, Dauria. 

 Anodon lierculeus, M. Scharanai. 



Anodon anatimis, Tunpuska. 



„ cellensis var. Beringiana, Kamt- 

 schatka. 

 Cj'clas calj^culata, Bernaul, E. Lena, R. 



Ami, S. Kamts. 

 Pisidiimi fontinale, Beresov. 



„ obliquum, Bernaul, Tomsk. 



2. LusiTAjnAN Eegion. 



Tiie countries bordering the Mediterranean, witli Switzerland, 

 Austria, and Hungary, the Crimea {Taurida), and Caucasus, 

 form a great province (or rather cluster of provinces) to which 

 Professor E. Forbes aj)plied the term Lusitanian. The Canaries, 

 Azores, and Madeira are outlying fragments of the same region.* 



In Southern Europe about 600 land-snails are found, of 

 which above 100 are also spread over the Germanic region and 

 Siberia ; and 20 or 30 are common to Northern Africa. Besides 

 these 60 others are found in Algeria and Egyjit, 100 in Asia 

 Minor and Syi'ia, and 135 in the Atlantic Islands, making a 

 total of nearly 900 species oi Helicidce.\ 



Of the 12 species of Zonites (proper) 10 are peculiar to 

 Lusitania. 



The species of Bulimus, Achatina, and Pupa are small and 

 minute, belonging to the sub-genera Bidimtdus, CioneUa, Zua, 

 Azeca, Vertigo, &c. ; 4 (of which 2 are Algerian) have been 

 referred to Glandina. 



In this region are also found 22 species of Cyclostomidce and 

 44 Limacidoe: — 



The fresh- water are shells of the same genera as in the Ger- 

 manic province, and the numbers about the same; with the addi- 

 tion of several species of Melania, Melanopsis, Lithoglyphus, and 

 Cyrena. Melanopsis hucciiioides is {ound in. Sipsdn, Algeria, and 



* In tlie South of Europe rain seldom f;ills in summer, hut is frequent at other 

 sea-sons, especially in winter. The mean temperature is 54" — 72-^. 



t The writer is greatly indebted to W. H. Benson, Esq., for information respecting 

 the land-shells of the Lusitanian province, Africa, and the remote islands. 



\ Many of these cannot be considered species, in the sense here understood, but Olily 

 as races, or geogiaphical varieties. 



