March, 1907.] Fossil Land and Fresh Water Mollusca 
iii 
At the same time, the recent mollusca of that vicinity should 
be collected carefully for comparison. It must be remembered, 
however, that most of the surface of north-western Ohio is now- 
under conditions radically different from what they were only 
fiftv to seventy years ago. It is safe to say that there are at 
present hardly more than five per cent of the mollusca living of 
what there were originally, that is, of individuals. Very probably 
also, the number of species has considerably decreased. 
The following is a list of the mollusca found, with a few notes. 
All of the species are now living in Ohio. 
1. 
2 . 
3! 
4. 
6 . 
7. 
8 . 
9. 
](). 
11 . 
12 . 
13. 
14. 
15 . 
16. 
17 . 
18 . 
19. 
20 . 
21 . 
22 
23 ! 
24. 
25. 
26. 
27. 
Gastrodonta ligera. Say, one specimen. 
Zonitoides arboreus Say, one specimen. 
Hyalina radiatula Alder, one specimen. 
“ indentcita Say, one specimen. 
“ (or Zonitoides) Iceviuscula Sterki, a western species having the 
eastern limit of its recent distribution in Ohio, so far as known. 
Circinaria concava Say, several specimens. 
Polygyra profunda Say, several 
multilincata Say, several. 
albolabris Say, one, large. 
zaleta Say (exoleta), a few. 
clausa Say, one fine specimen. 
mitchelliana Lea, one specimen. 
thyroides Say, a few. 
elevata Say, several, the commonest of all, except No. 25. 
fraudidenta Pilsbyr (“fallax Say” of authors), two. 
inflecta Say, two. 
hirsuta Say. 
Palula (Pyramidula) solitaria Say, large, several. 
alternata Say, a few. 
striatella Anthony. 
Bifidaria contracta Say, one. (Pupa contractu Say.) 
Succinea avara Say, one, rather large. 
retusa Lea, one. 
Phyra sp., one specimen, broken to fragments. 
Pomatiopsis lapidaria Say, common. 
Pisidium compression Prime, two left valves. 
fallax Sterki, one valve. 
Of Unionidce , numerous fragments were found, but all too 
small to be identified; most of them were near the top laver. 
A large part of the shells were more or less damaged; few in 
perfect condition. 
Fossil land and fresh water shells should be collected wherever 
found. But caution is necessary: they should not be cleaned 
more than required for identification, and under no condition 
should they be washed; water will damage them, especially 
will it loosen the outer layer of shell substance in the aperture, 
■containing the characteristic parietal teeth of the Polvgyrae etc. 
New Philadelphia, Ohio. 
