108 THE NAUTILUS. 
Urser Brynen-Concuyt. der Kiistenzone von Rio Grande do 
Sul, von Dr. H. von Ihering.—From the study of land snails found 
in Quaternary deposits the conclusion is reached that formerly the 
region in question was wooded, and more favorable to snail life 
than the present sandy expanse with sparing grass growth. In the 
living fauna a remarkable new genus of Succinide occurs, like a 
Hyalimax with completely internal, spireless shell. 
Dre SusswassER-BIVALVEN JAPANS, von H. von Ihering (Abh. 
Senck. naturforsch. Gesellsch.).—In the discussion of the species, 
this work supplements Kobelt’s Fauna Japonica, describing several 
new specific forms. Inthe Japanese bivalve fauna, v. Ihering finds 
only East Asiatic types, and those occupying the entire Holarctic 
tract (such as Margaritana margaritifera). There are no peculiar 
forms of more than specific value, the fauna being merely a part of 
that of the adjacent Siberian and Chinese countries, unspecialized 
except in the specific characters, and many of the species are very 
near those of the mainland. It is interesting to find that these 
results coincide with the facts known in regard to the freshwater 
gastropods and the land shells. Except that the mollusk fauna of 
Japan has a more southern aspect than that of the adjacent main- 
fand (due to the warm ocean current, the “ Gulf stream of Japan”), 
there is no difference of any importance in zoogeography. 
PRELIMINARY List oF THE Motiusca OF ARKANSAS, by F. A. 
Sampson (Ann. Rep. Geol. Surv. Ark., Vole II)—81 species are 
the result of several years work by Mr. Sampson, not including 
Unionide, which will be treated separately. The State has been 
little known to conchologists hitherto, and the present catalogue 
supplies data for the southwestern range of a considerable number 
of species. It is judiciously annotated, and illustrated with wood- 
cuts of Triodopsis edentata Sampson. 
A BrotocicaL EXAMINATION OF LAKE Sr. Ciarr (Bull. Mich- 
igan Fish Commission, No. 4)—The present preliminary account 
details the methods adopted by the Michigan Fish Commission, 
with brief lists of the various forms of life, a map of the lake, ete. 
The mollusks were studied by Mr. Bryant Walker and listed on 
pp- 43, 44. More elaborate reports on the principal groups are in 
preparation. 
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