NATURAL SCIENCES OF PHILADEEPHIA. 
165 
Resolved, That the Academy will cheerfully assist Dr. Hayes in carrying out 
his plans by all the means in its power. 
The Report and resolutions were adopted, and the Committee con- 
tinued. 
Juli/ 13th. 
Dr. Thos. McEuen in the Chair. 
Twenty-three members present. 
Dr. Corse observed that in pursuance of some observations made at a 
former meeting, be had examined Arctomys monax, Sciurus hudsonius, 
and Tamias Lysteri, and found the testicles so arranged as to be readily 
drawn up into the belly. 
Jul^ 20th. 
Vice-President Bridges in the Chair. 
Fifteen members present. 
A paper was presented for publication in the Proceedings, entitled 
Notes upon various New Genera and New Species of Fishes, in the 
Museum of the Smithsonian Institution, and collected in connection 
with the United States and Mexican Boundary Survey, Major Wm. 
Emory, Commissioner, by Charles Girard, M. D." 
Jul?/ 27th. 
Dr. Thos. McEuen in the Chair. 
Eleven members present. 
The following papers were ordered to be printed in the Proceedings : 
Descriptions of Twelve New Species of TTNIONES and other Fresh-water Shells 
of the United States. 
BY ISAAC LEA. 
Unio Roswellensis. Testa laevi, oblonga, subcompressa, ad latere compressa, 
postice biangulata, valde inaequilaterali ; valvulis subcrassis ; natibus subpro- 
minentibus ; epidermide tenebroso-fusca, striata ; dentibus cardinalibus sub- 
grandibus, crenulatis, in utroque valvulo subduplicibus ; lateralibus praelongis 
subrectisque ; margarita vel purpurea vel salmonis colore tincta et iridescente. 
Hab. — Chatahoochee River, at Roswell, Cobb Co., Georgia. N. A. Pratt, Jr. 
Unio Postellii. Testa laevi, oblonga, compress^,, postice subbiangulata, valde 
inaequilaterali; valvulis subcrassis; natibus prominulis, ad apices undulatis ; epi- 
dermide tenebroso-fusca, transverse striata; dentibus cardinalibus magnis, in 
utroque valvulo duplicibus, crenulatis; lateralibus praelongis, lamellatis subrec- 
tisque ; margarita vel alba vel purpurea vel salmonis colore tincta et iridescente. 
Hab. — Randall's Creek, near Columbus, Georgia, Bishop Elliott ; and at Car- 
ter's Creek, Baldwin County, Georgia, J. Postell. 
Unio Neislerii. Testa regulariter plicata, quadrata, inflata, ad latere sub- 
planulata, valde inaequilaterali ; valvulis crassis ; natibus prominentibus tumi- 
disque ; epidermide nigricante, valde striata ; dentibus cardinalibus magnis, 
crassis, crenulatis, in introque valvulo duplicibus ; lateralibus crassis, sublongig 
curvisque ; margarita argentea et valde iridescente. 
Hab. — Flint River, at Lanier, Georgia. Dr. H. M. Neisler. 
1858.] 
