MOLLUSCA. 
509 
7, Vaginulus 2, IAmn<Ba 2, Physa 3, Planorhis 8, Ancylus 4, Gundlachia 
3 (two of which not known to the author), Poeyia 1, Ampullaria 3, Palu- 
dina 1, Paludinella 2, Amnicola 2, Melania 6, Neritina 4, ^ Cyrena 1, 
Sphmium 1, Pisidium 2, and Uiiio 2 species. Report, fisico-nat. de Cuba^ 
ii. pp. 73-90. 
A new Cuban Cyclostoma is added by Pfeiffer, Mai. Blatt. xiv. pp. 209-211. 
Some new land-shells from the Bahama Islands, collected by Dr. Bryant 
and W. Miller, are described by Pfeiffeb, Mai. Blatt. xiv. pp. 126-130, and 
166, 166. 
G. North America, 
Mr. Tryon^s monograph of the terrestrial Mollusca of the 
United States, which is continued in the Am. Journ. Coneh, 
vol. hi., contains an interesting account of their distribution. 
The most characteristic features of North -American Helix 
consist in some nearly allied and perhaps too minutely distin- 
guished groups (called genera by Tryon), viz. IJloslomay Me- 
sodoriy Holotrema, Triodopsis, Isognomostoma, and Stenotremaj 
with 46 North- American species. The groups JDeedalochila 
and Polygyra, with 32 species, are represented chiefly in the 
Southern States from Mexico and Texas to Florida and (Georgia; 
but some species, for example D. leporina (Gould), advance as 
far northwards as Indiana and Illinois. Out of 25 OrthalicidcRy 
the two species of Lignus, the single species of Orthalicus, and 
four Bulimulus are limited to Florida, or rather extend from the 
West-Indian islands to this peninsula. Bulimulus dealbatus (Say) 
is the only one occurring on the mainland east of the RockyMoun- 
tains and east of Texas, viz. in North Carolina, Alabama, Mis- 
souri, and Arkansas. All the rest, viz. 17 species of Bulimulus , 
belong to Texas, California, or Mexico. Of the genus Pupa only 
the subgenera Pupilla and Leucochila, as well as the genus Ver~ 
tigOy are represented, each by several species peculiar to North 
America, and spread throughout the mainland. Zoogenetes is 
also truly North American; but Strophia, Macro ceramMSy Mela- 
niellay OpeaSy Cylindrellay and Veronicella are West-Indian 
types, extending with some species to Florida — Cylindrella and 
Macroceramus also to Texas. Zua suhcylindrica \luhricci\ is a 
circumpolar species extending in North America from New Eng- 
land and the Middle States to the Lake of the Woods and the 
Western Territories. Zoogenetes y with one species, harpa (Say), 
is boreal from Maine to Iowa. [It occurs also in Northern 
Sweden, and is therefore circumpolar.] Acicula aciculuy Rumina 
decollatUy and some Limax are introduced from Europe. Am. 
Journ. Conch, iii. pp. 298-317. 
Binney^s publications on land- and freshwater shells of North 
America (Smithsonian Collections, Nos. 143 and 144, see above 
p. 486) have the object of collecting in a concise form the whole 
of our knowledge concerning the North- American freshwater 
