110 Tertiary Strata of the Atlantic Coast. 
Pholas costata, Lam. Corbula contracta, Say. 
Venus alveata, Conrad. ata, Say. 
Pectunculus pectinatus, Lam. Plicatula marginata, Say. 
circularis, Conrad. |Cyrena carolinensis. 
Cardita granulata, Conrad. Rangia cyrenoides, Des Moulins 
Amphidesma transversa, Say. _| Astarte concentrica, Conrad. 
Lucina divaricata, Lam. Nucula acuta, Conrad. 
Strigilla carnaria, Turton. Panopea reflexa, Say. 
Mysia rotundata ? Ostrea virginiana, Gmel. 
Amphidesma inequale, Say. Venus deformis, Say. 
Cardita tridentata, Say. 
List of fossil shells of the Newer Pliocene on the Potomac. 
Crepidula convexa, Say. Mya arenaria, Lin. 
glauca, Say. Mytilus hamatus, Say. 
Fusus cinereus, Say. Nucula limalula, Say. 
Nassa obsoleta, Say. acuta, Conrad. 
~ trivittata, Say. Pandora trilineata, Say. 
Natica duplicata, Say. Petricola pholadiformis, Lam. 
interna, Say. Pholas costata, Lam. 
Ranella caudata, Say. Sanguinolaria fusca, Conrad. 
ia. ———__——— lusoria, Conrad. 
Turritella alternata, Say. Solecurtus caribeus, Blain. 
Arca transversa, Say. Solen ensis, Lin. 
ponderosa, Say. Venus mercenaria, Lin. 
Corbula contracta, Say. Rangia cyrenoides, Des Moulins. 
Cytherea Sayana, Conrad. Ostrea virginiana, Gmel. 
Mactra lateralis, Say. 
The species in the preceding lists printed in italics, have not hith- 
erto been found recent. 
The foregoing lists of species shew how much the fossils of syn- 
chronous strata may differ specifically, without being so remote from 
each other as to induce the naturalist to expect much diversity of 
species, _ 
Other localities of the newer Pliocene in North Carolina have 
been identified by a series of fossils sent by Prof. Elisha Mitchell, 
of Chapel Hill, to the Academy of Natural Sciences. To this for- 
mation also, belong the beds of oyster shells in New Jersey, on the 
Eastern shore of Maryland, in Virginia, &c., and these were depos- 
ited exclusively in lagoons whilst the former class of shells are either 
of estuary or oceanic origin. 
