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124 ZOOLOGICAL GEOGRAPHY. [part in.
Cerambycidse ; Leptostylus, Liopus, Graphidurus, and Tetraopes,
of the Lamiidse, the latter plus being confined to the region.
Terrestrial and FluviatiU Mollusca.
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.
Binuey's recent "Catalogue of the Terrestrial Air-breathing
MoUusks of North America," the feuna consists of the following
genera :
—
Glandina (6 sp.) ; MacromjcUs (5 sp.) ; Zonites (37 sp.)
Vitrina (4 sp.) ; Limax (5 sp.) ; Avion (3 sp.) ; Ariolimax (3 sp.) ;
Prophysaon (1 sp.) ; Binneia (1 sp.) ; Hemipliillia (1 sp.) ; Patula
(16 sp.); Helix (80); Holospira (2 sp.) ; Cylindrella (2 sp.)
Macroceramus (2 sp.) ; Bulimuliis (8 sp.) ; Ctondla (2 sp.) Steno-
;
gyra (4 sp.) ; Pupa (19 sp.) ; Strophia (1 sp.) ; Vertigo (6 sp.)
Liguus (1 sp.) ; Orthalicus (2 sp.) ; Punctum (1 sp.) ; Succinea
(26 sp.); Tebennophorus (l.sp.); Pallifera (1 sp.) ; Veronicella
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 Remiphillia, are
confined to the Western sub-region. Lower Cahfornia has
affinities with Mexico, 18 species being peculiar to it, of which
two are true Bulimi, a genus unknown in other parts of the
.region. The Central or Kocky 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 Alleghanies. The
Canadian sub-region possesses 32 species, of which nearly half
are northern forms more or less common to the v/hole Arctic
regions, and several of this character have spread southwards all
;