par 
ing as it,does of several hundred specimens, and was made 
by the late Thomas Say, the husband of the donor. 
On motion, the thanks of the Society were voted to Mrs. 
Say, for her valuable donation. 
Mr. A. J. Cotheal read a letter from Mr. Archbald, at 
present in Italy, soliciting exchanges of the shells of the 
United States, and the West Indies, for those of Italy and 
the. Mediterranean. 
Prof. O. W. Morris, exhibited a portion of the stem of a 
Cornus, which broke in a remarkable manner in consequence, 
probably, of the borings of the larva of an insect present in 
it. On examination, Prof. D. S. Martin pronounced the larva 
to be that of Caladium violaceum. He also exhibited a 
number of fresh water shells from the Monongahela River, 
near Morgantown, and remarked that the shells found in the 
rivers east of the Alleghany Mountains were, as a general 
thing, elongated in outline, and thin in texture, while those 
- west of the mountains are mostly rounded in form and thick. 
Dr. R. P. Stevens, remarked that the Unios of Western New 
York, and west of that state; present very great differences of 
character in the same species. The specimens found on the 
bar of Mud Creek are beautifully colored, while those found 
in other parts of the same stream are nearly devoid of color. 
Prof. O.-W. Morris stated that the Unios found in the 
Holston River, have the nacre highly colored, while those 
from the Clinch and Little Tennessee are colorless. 
The President remarked that the fossil fresh water shells of 
the West, present a very great variety in form and other 
characters, in the earlier formations; but from the Whealden 
to the present time, the shells have preserved their character- 
istic forms throughout the whole period. The marine shells, 
on the contrary, have changed very greatly. In many 
instances whole genera have died out. 
Mr. W. H. Leggett exhibited a specimen of Anemone 
nemorosa from Bergen Point which had the leaves covered 
upon the under side with a minute fungus. He remarked 
