E.. Desor on the Post-Pliocene of the Southern States. 51 
Arca transversa, Say. Pandora trilineata, Say. 
Arca ponderosa, Say. Petricola pholadiformis, Lam. 
Corbula contracta, Say. Pholas castata, Lam. 
nathodon cuneatus, Gray, Sanguinolaria fusca, Say. 
pray Sayana, Conrad. Tellina lusaria (Psammobia lusaria,) 
actra lateralis, Say LY. 
a arenaria, ZL. : Solecurtus caribeus, Lam. 
Mytilus hamatus, Say. Solen ensis, Zam. 
Nucula limatula, Say. Venus mercenaria, Lam. 
Nucula acuta, Conrad. 
Actzon melanoides, Conrad. Buccinum obsoletum, Say. 
Crepidula convexa, Say. ' Buccinum trivittatum, Say. 
Crepidula glauca, Say. Natica duplicata, Say. 
Fusus cinereus, Say, anella caudata, Say. 
There is some probability that the regularly stratified beds of 
dark-blue clay at Baltimore and along the Chesapeake and Dela- 
ware Canal, with its beds of lignite and decayed trees, - together 
with the mingled mass of diluvium which reposes upon it, be- 
long to the same formation. We are also inclined to refer to this 
said of the superficial deposits between the Chesapeake and 
Delaware, which extend over the State of Delaware and a great 
fossil remains, (at Brooklyn near New York.) And although 
haria, the Serpula and others occur exactly in the same position 
in which they lived and and died, : 
n Comparing the species from the bluffs of Sancoti head on 
the island of Nantucket with the above mentioned list from the 
otomac or with the list of the Post-pliocene fossils of South Car- 
Olina as given by Mr. Tuomey, I find that among the seventeen 
Species which I collected at Sancoti head,} there are but six which — 
do not occur there, viz., Astarte castanea, Cardita borealis, Osirea 
nei eidenaia a ee y 
don on the Potomac, which might with just as much reason be referred to Indian 
peency. tte bode of at teearipaice occur in Cumberland county, at Egg Har- 
bor on the Severn, at Easton in Maryland, upon the York river in Virginia, and upon 
various other rivers of the southern states. ; 
* Among the ies which I collected at Brooklyn are Venus mercenaria, M. 
arenaria, ee Buecinum undatum, Buccinum trivittatum, all of which 
occu in the Post-pliocene of South Carolina. 
t See the list of the fossils of Sancoti Head, farther below. 
