NATURAL SCIENCES OF PHILADELPHIA. 
135 
the 31st volume of Silliman's Journal. They, however, had found it only in 
brackish water, and upon the operculas or gill covers. These had been found 
in a creek at least fifty miles from salt water, and upon the gills themselves, 
which were highly congested, apparently from the attacks of these animals. 
June StJi. 
Vice President Lea in the Chair. 
Twenty-nine members present. 
Announcements were made of the death of Dr. Johannes Miiller, a 
Correspondent, and of Robert A. Caldcleugh, late a member of the 
Academy. 
June Ibih. 
Dr. T. B. Wilson in the Chair. 
Thirty-three members present. 
Mr. Lea exhibited a specimen of Unio ruhiginosiis Lea, and remarked that, at 
a late meeting, he had called the attention of the Academy to a specimen of 
Unio muUiplicatus Lea, which had both leaves of the branchise on both sides charged 
with j'-oung shells, which he then supposed to be peculiar to that species. 
Within a few days he had received from Cincinnati a number of species in a 
living state ; and he was surprised to find, in a fine female rubiginosus^ which he 
exhibited to the Academy, both leaves on both sides fully charged, the whole width, 
with sacks of ova of a deep rose color. These were not matured into the perfect 
shell, but each ovum was filled with red granulations, which gave a clear red tint 
to the whole of the four masses. On making an incision into the abdominal 
mass, he found the ovary fully charged with red eggs, which, passing out of the 
cut made by the scalpel, gave the appearance of arterial blood. The mass of 
the soft parts of this species is usually salmon-color or orange, but it is some- 
times white, and this female was of the latter color. 
June 22c?. 
Vice President BPtiDGES in the Chair. 
Thirty-one members present. 
The following papers being presented for publication in the Proce ed- 
ings, were referred to Committees : 
Prodromus descriptionis Animalium evertebratorum, quse in Expe- 
ditione ad Oceanum Pacificum Septentrionalem, a Republica Federata 
missa, Cadwaladaro Ringgold et Johanne Rodgers ducibus, observavit 
et descripsit W. Stimpson. Pars. VI. Crustacea Oxystomata. 
Descriptions of seven nev^ species of Margaritana, and four new species 
of Anodonta, by Isaac Lea. 
Notes to a second edition of a Geological Map of Nebraska and Kansas, 
by F. V. Hayden, M. D. ^ 
A letter from Mr. Edward Harris was read, containing the following 
statements regarding specimens of Salmo Gloverii Girard, presented 
this evening : 
1858.] 
