190 
PROCEEDINGS OF THE ACADEMY OF 
ing of the masses, and numerous specimens of statoblasts also received, are 
all referable to the rectinatclla onagnifica. I bad been prepared for this an- 
nouncement by repeated information of medical students from the south- 
western portion of our country. Some of them have stated they had seen 
these jelly-like masses even as large as a half-bushel measure. Mr. Stimpson, 
the accurate naturalist, has informed me, that as early as 1850 he had detected 
large brain-like masses of Polyzoa attached to stones in the Middlesex canal, 
near Boston. As Pectinatella, so far as my observations go, has always been 
found attached to branches of trees, perhaps from the difference of habit, the 
brain-like masses may prove to be distinct. 
Dr. Leidy further exhibited drawings of a species of Fredericella, which is 
found in the Delaware and Schuylkill rivers, near Philadelphia, and also in Lily 
Pond, near Newport. He has not yet positively ascertained whether the species 
is different from that found in Europe. He added, that two years since he had 
detected a species of Lophopus in the Schuylkill river, but he had not yet had 
leisure to determine its character. 
JVov. 9/A. 
Twenty-seven members present. 
A paper was presented for publication in the Proceedings entitled : 
Notes on American Land Shells, No. IV, by W. Gr. Binney, and 
was referred to a Committee. 
Vice-President Bridges in the Chair. 
Thirty five members present. 
The following note, relating to the fossils presented this evening by 
Mr. David Christy, was read : 
This fossil I have supposed to be the Orthis bellarugosa, Conrad, which must 
have been figured from a young specimen. Hall's 0. insculpta is an old worn 
specimen of it, sent by myself before we had discovered the locality for perfect 
specimens. It occurs at Oxford, Ohio, about 200 ft. below the Cliff Limestone, 
and has a vertical range of only a few feet. Its geographical range is exten- 
sive. The locality from which the best specimens come is 14 miles west of 
Oxford, where they occur in marlite, and the associated fossils I will give ac- 
curately hereafter. 
Mv. 2Sd. 
Vice-President Bridges in the Chair. 
Thirty five members present. 
The following papers were presented for publication in the Journal : 
Description of the Embryonic forms of thirty-eight species of Uni- 
ooidaj, by Isaac Lea, LL.D. 
New Unionidae of the United States, by Isaac Lea, LL.D. 
And one for publication in the Proceedings, entitled : 
Catalogue of Birds collected by A. A. Henderson, M. D., U. S. N., 
at Hakodadi; Island of Jesso, Japan^ with notes, by John Cassin. 
And were referred to Committees. 
[Nov. 
