64 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
Dalmanella virginia. 
Fig. 10. Mold of interior of pedicle valve. 
11. Mold of exterior of brachial valve. 
12. Mold of interior of brachial valve. 
13, 16. Molds of exterior pedicle valves. 
Dalmanella virginia var. beta. 
Kigs. 14 and 15 molds of the exterior and interior of a young specimen of a 
brachial valve. p 
All the specimens of Dalmanella virginia are from the Chemung formation, 
White Sulphur Springs, Wést Virginia. 
The specimens figured in this paper all belong to the collections of the U. S. 
Geological Survey, ultimately to be deposited in the U. S. National Museum, 
in Washington, except specimens fig. 7, 25, and 26 of Plate II, and figs. 5, 7, 
and 9 of Plate IV, which belong to the collections of Cornell University Museum, 
Ithaca, New York. 
