124 ZOOLOGICAL GEOGRAPHY. [part in. 



Cerambycidse ; Leptostylus, Liopus, GrwpMdiirus, and Tetraopes, 

 of the Lamiida?, the latter genus being confined to the region. 



Terrestrial and Fluviatih Molhisca. 



The land-shells of temperate North America almost all belong 

 to the luoperculate or Pulmoniferous division ; the Operculata 

 being represented only by a few species of Helicina and 

 Truncatella, chiefly in the Southern States. According to Mr. 

 Binney's recent " Catalogue of the Terrestrial Air-breathing 

 Mollusks of North America," the fauna consists of the following 

 geneva:— Glanclina (6 sp.) ; Macrocyclis (5 sp.) ; Zonitcs (37 sp.) ; 

 Vitrina (4 sp.) ; Limax (5 sp.) ; Avion (3 sp.) ; Ariolimax (3 sp.) ; 

 Prophysaon (1 sp.) ; Binneia (1 sp.) ; Hcmipliillia, (1 sp.) ; Patula 

 (16 sp.) ; Helix (80) ; Holospira (2 sp.) ; Cylindrella (2 sp.) ; 

 Macroceramus (2 sp.) ; Bidimulus (8 sp.) ; Ct'onella (2 sp.) ; Steno- 

 gyra (4 sp.) ; Pu2M (19 sp.) ; Strophia (1 sp.) ; Vertigo (6 sp.) ; 

 Liguiis (1 sp.) ; Orthalicus (2 sp.) ; Punctum (1 sp.) ; Succinea 

 (26 sp.) ; Tebennophorus (1 sp.) ; Palli/era (1 sp.) ; Vcronicclla 

 (2 sp.). 



All the larger genera range over the whole region, but the 

 following have a more restricted distribution ; Macrocyclis has 

 only one species in the East, the rest being Californian or 

 Central ; Ariolimax, Prophysaon, Binneia, and Hemiphillia, are 

 confined to the Western sub-region. Lower California has 

 affinities with INIexico, 18 species being peculiar to it, of which 

 two are true Bidimi, a genus unknown in other parts of the 

 region. The Central or Rocky Mountain sub-region is chiefly 

 characterised by six peculiar species of Patula. The Eastern 

 sub-region is by far tlie richest, nine-tenths of tlie whole 

 number of species being found in it. The Alleghany Mountains 

 form tlie richest portion of this sub-region, joossessing nearly 

 half the total number of species, and at least 24 species found 

 nowhere else. The southern States have also several peculiar 

 species, but they are not so productive as the Alleghanies. The 

 Canadian sub-region j)Ossesses 32 species, of which nearly half 

 are northern forms more or less common to the whole Arctic 

 regions, and several of this character have spread southwards all 



