26 Moll. 
MOLLUSCA. 
tho fresh-water shells of Australia, enumerating all known species with 
critical remarks, and describing and figuring many new ones. It contains 
11 species of Melania , 9 Vivipara , 1 Larina, 4 Bithynia , 1 Gabbia, 1 Palu- 
dinella, 1 Amnicola, 1 Tatea, G Ilydrobia , 11 Limncea , 52 Physa , 1 P/<y- 
sopsis, G Planorbis , 2 Segmeniina , 1 Ancylua, 11 Neritina, 1 Navicella , 8 
Corbicula , 4 Sphcerium, 3 Pisidium , 17 £7mo, and 1 Mycetopus ; finally 14 
pseudo-Australian species are mentioned. J. L. S. xvi. pp. 255-317, 
pis. v.-vii. 
R. Tate also enumerates the Australian fresh-water shells, viz., 16 
species of Limncea , 54 Physa , 1 Physopsis , 1 Ancylus , 1 Gundlachia, 7 
Planorbis , 7 Melania , 10 Paludina , 1 Valvata, 1 Navicella , 7 Neritina , 
7 Bithynia , 4 Amnicola , 2 Bithynella , 2 Ilydrobia , 1 Paludinella, 1 Tatea, 
2 Pomatiopsis , 2 Assiminea, 3 Sphcerium, 3 Pisidium , 9 Corbicula , 1 Batissa , 
10 Cyrena , 1 Mycetopus, 18 £7m’o, 2 Alasmodon ; P. Linn. Sue. N. S. W. 
vi. pp. 552-5G9. Note on some species of Melania, Paludina, Physa, 
LJnio, Alasmodon, and Corbicula from New South Wales, by J. Brazier, 
o/?. citf. vii. pp. 83-86. 
iWu> Zealand. Anatomical notes concerning some land snails, syste- 
matic ones concerning the Ilydrobiidce and fresh- water Bivalves, by F. W. 
Hutton, Tr. N. Z. Inst. xiv. pp. 143-160, pis. i.-v. 18 species of fresh- 
water Mollusca , genera Aplexa, Planorbis , Latin , Melanopsis, Ilydrobia 
[Potamopyryus'], Pisidium, and C/w/o, enumerated by the same, P. Linn. 
Soc. N. S. W. vii. pp. 67 & 68. 
Campbell Island. 1 new species of Ilelix , Filiiol, Bull. Soc. Philom. 
1880. 
14 . North America. 
A. G. Wetiierby continues his observations ou the geographical dis- 
tribution of North American fresh-water shells [see Zool. Rec. xvii .Moll. 
p. 27], distinguishing the following peculiar faunas : — 
(a) The more northern circumboreal rather lacustrine fauna, represented 
chiefly by species of Limncea, Physa, Planorbis , and Anodonta. 
(b) Some species of Unio and Anodonta spread from Maine to the 
boundaries of Mexico, and from New York to Minnesota. 
(c) The Strepomatidce (North American Melaniidce ) peculiar to rapid 
stony rivers, plentiful in the east and very limited west of the Mississippi. 
(d) The Ohio types of Unio , between the Ohio and Tennessee, the 
Appalachian mountains and the Mississippi. 
Generally, the fauna of hilly regions are rather peculiar, the species of 
them having a more limited geographical distribution, because the 
variety of external physical conditions is greater in them than in the 
plains, and renders the natural selection in the adaptation to distinct 
localities more powerful. J. Cincinn. Soc., Oct. and Dec. 1881; also in 
Am. J. Sci. (2) xxiii. pp. 203-212. [The same can be said also concerning 
other parts of the world. — Rec.] 
Note onWetherby’s paper by R. Ellsworth Call, Am. Nat. xvi. 
pp, 400-402. 
R. Stearns gives some interesting notes on the distribution of Ano- 
