124 
ZOOLOGICAL GEOGRAPHY. 
[part III. 
Cerambycidse ; Leptostylus, Liopus, Graphidurus, and Tetraopes , 
of the Lamiidee, the latter genus being confined to the region. 
Terrestrial and Fluviatile Mollusca. 
The land-shells of temperate North America almost all belong 
to the Inoperculate 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 
genera : — Glandina (6 sp.) ; Macrocyclis (5 sp.) ; Zonites (37 sp.) ; 
Vitrina (4 sp.) ; Bimax (5 sp.) ; Avion (3 sp.) ; Ariolimax (3 sp.) ; 
Prophysaon (1 sp.) ; Binneia (1 sp.) ; Remiphillia, (1 sp.) ; Patula 
(16 sp.) ; Helix (80) ; Holospira (2 sp.) ; Cylindrella (2 sp.) ; 
Macroceramus (2 sp.) ; Bulimulus (8 sp.) ; Cionella (2 sp.) ; Steno- 
gyra (4 sp.) ; Pupa (19 sp.) ; Strophia (1 sp.) ; Vertigo (6 sp.) ; 
Liguus (1 sp.) ; Orthalicus (2 sp.) ; Punctum (1 sp.) ; Saccinea > 
(26 sp.) ; Tebennophorus (1 sp.) ; Pallifera (1 sp.) ; Veronicella 
(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 Mexico, 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 the richest, nine-tenths of the whole 
number of species being found in it. The Alleghany Mountains 
form the richest portion of this sub-region, possessing 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 Alleglianies. The 
Canadian sub-region possesses 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 
