LTJSITANIAN KEGIOIf. 



91 



Bithynia Kickxii, E. Ami, Altai. 

 Valvata cristata, var. Sibirica, Bernaul, 

 Beresov; Kamtschatka. 

 „ piscinalis, K. Ami. 

 Unio complanatus Kamtschatka. 

 „ Dahusicus, Mid. Scliilka. 

 „ Mongolicus, M. Gorbitza, Dauria. 

 Anodon herculeus, M. Scharanai. 



Anodon anatinus, Tunguska. 



„ cellensis var. Beringiana, Kamt- 

 schatka. 

 Cj'claa calj''culata, Bernaul, E. Lena, E. 



Ami, S. Kamts. 

 Pisidium fontinale, Beresov. 



„ obliquum, Bernaul, Tomsk. 



2. LUSITANIAN EeGION. 



The countries bordering tlie Mediterranean, with Switzerland, 

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

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

 Professor E. Forbes applied 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 Egypt, 100 in Asia 

 Minor and Syria, and 135 in the Atlantic Islands, making a 

 "total of nearly 900 species of Helicidoe.-f 



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

 Lusitania. 



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

 minute, belonging to the sub-genera BuUmulus, Cionella, Zua, 

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

 referred to Glandina. 



In this region are also found 22 species of Cydostomidce and 

 44 Limaddce: — 



Helix 392 



Bidimus 80 



Succinea 8 



Achatina 25 



Tornatellina 3 



Balea 4 



Pupa 120 



Clausiliat ,., 247 



Vitrina 11 



Daudebardia 3 



Helicolimax 3 



Limax 28 



Arion 7 



Phosphorax 1 



Testacella 2 



Parmacella 5 



CrjT)tella 1 



Cyclostoma 5 



Craspedopoma 3 



Pomatias 10 



Acicula , 4 



Caiychium 3 



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, LitJioglyphus, and 

 Cyrena. Melanopsis huccinoides is found in Spain, Algeria, and 



* In the South of Europe rain seldom falls in summer, but is frequent at other 

 seasons, 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, Afri,ca, and the remote islands. 



X Many of these cannot be considered species, in the sense here understood, but only 

 as races, or geographical varieties. 



