1841 .] 
THE NATIONAL INSTITUTION, 
121 
Four Medals, electrotyped by the same.— -From the same. 
Three Cat Squirrels, ( Sciurus driereus.)—From Theodoric B. Skin¬ 
ner. 
Gray Squirrel, (Sciurus carolinensis,) from Somerset County, Eastern 
Shore Maryland.— From Theodoric B. Skinner . 
Perna Maxidata imbedded in blue clay, from the estate of George 
Wilkinson, near Huntingdon, Calvert County, Maryland.— From 
Mr. Wilkinson. 
Fossils from the Calvert Cliffs.— From Dr. James Tongue , Calvert 
County , Maryland. 
Fossils from the Patuxent.— From Dr. G. Granger Tongue, Cal¬ 
vert County , Maryland. 
Crystalized Selenite, from the estate of Dr. Robert Neale, below the 
mouth of the Patuxent, St. Mary’s County, Chesapeake Bay.— 
From Dr. Neale. 
Selenite and Fossils, from St. Mary’s river, Maryland.— From Dr. 
James W. Roach. 
Panopea Americana, &c., from the Patuxent.— -From Chapman Bil¬ 
ling sly, St. Mary’s County , Maryland. 
Shells, &c.— From Mrs. Dr. J. Mitchell, of Sidney, New South 
Wales. 
Catalogue of Shells, &c., presented by Mrs. Mitchell. 
1 Galeolaria, group 
2 Ostrea, 
3 Nerita, 
5 Triton, 
on sand stone. 
3 Terebratula, 
2 Partula, 
1 Cassis, 
2 Corunulae, 
2 Crepidula, 
2 Stomatella, 
4 Purpura, 
3 Balanus, 
9 Ancylus, 
4 Haliotis, 
12 Buccinum, 
2 Cleidothcerus, 
12 Chiton, 
1 Solarium, 
2 Nassa, 
4 Venerirupis, 
1 Chitonellus, 
6 Trocus, 
2 Mitra, 
1 Tell ina, 
4 Patella, 
3 Littorina, 
1 Voluta, 
3 Cytherea, 
2 Bulla, 
2 Phasianella, 
1 Cymba, 
6 Venus, 
19 Helix, 
2 Turbo, 
48 Cyprcea, 
3 Area, 
1 Cyclostoma, 
5 Cerithium, 
16 Oliva, 
5 Cyclas, 
2 Vitrina, 
3 Turbinellus, 
7 Conus. 
4 Cham a, 
10 Limnoea, 
7 Strombus, 
8 Geological specimens from Carbo. 5 Papers of Seed. 
niferous formation. 1 Box of Insects. 
2 Mineralogical specimens. 1 Large section of Fossil Wood. 
Anadonta, found near the President’s House, on the Potomac, 
From H. C. Williams. 
