THE NATIONAL INSTITUTION- 
187 
Univalves. 
Conus diluvianus, Green. 
Cancellaria lunata, Conrad. 
Cassis coelata, Conrad. 
Dentalium dentalis , Lara. 
Dispotcea costata, Say. 
Dispotsea grandis, Say. 
Fusus tetricus, Conrad. 
Fusus sulcosus, Conrad. 
Fusus rusticus, Conrad. 
Fusus cinereus, Say. 
Fusus quadricostatus, Say. 
Fusus parilis, Conrad. 
Fusus strumosus, Conrad. 
Fulgur coronatus, Conrad. 
Fulgur fusiformis. 
Fulgur canaliculatus. 
Bivalves. 
Artemis acetabulum , Conrad. 
Astarte planutata, Conrad. 
Arnphidesma carinata, Conrad. 
Area idonea, Conrad. 
Cardium laqueatum, Conrad. 
Cardita granulata, Say. 
Corbula cuneata, Say. 
Cytherea Say ana, Conrad. 
Isocardia rustica, Sow. 
(, Lucina cribraria, Say. 
Mactra ponderosa, Conrad. 
Univalves. 
Pleurotoma parva, Conrad. 
Pleurotoma rotifera, Conrad. 
Pleurotoma gracilis, Conrad. 
Pleurotoma dissimilis, Conrad. 
Scalaria clathrus. 
Scalaria expansa, Conrad. 
Terebra simplex, Conrad. 
Terebra ioxonema, Conrad. 
Trochus humilis, Conrad. 
Trochus reclusus, Conrad. 
Turritella plebeia, Say. 
Turritella variabilis, Conrad, 
Typhis acuticosta, Conrad. 
Voluta solitaria, Conrad. 
Voluta mutabilis, Conrad. 
Turritella Iaqueata, Conrad. 
Bivalves. 
Mactra subcuneata, Conrad. 
Ostrea---? 
Pecten Madisonius, Say. 
Pholas arcuata, Conrad. 
Pholadomya abrupta, Conrad. 
Saxiccva rugosa ? 
Solen ensis ? 
Venus alveata, Conrad. 
Venus Mortoni, Conrad. 
Venus tetrica, Conrad. 
Multivalves. 
Balanus proteus, Conrad. 
Balanus ovularis , Lam. 
From all the various localities of this formation I have obtained about two hun¬ 
dred and thirty-nine species of shells and corals; among these I find thirty-six spe¬ 
cies which are now existing on the coast of the United States. The number of 
recent, compared with extinct forms, will therefore bring this formation within the 
limits of the miocene period. My only doubt, heretofore, has been that it could be 
referred to the era of the Bordeaux deposits; but since Mr. Lyell has suggested 
that the latter may be an older portion of the miocene than the crag of England, 
which I have always regarded as identical in age with our medial tertiary, I have 
no longer any objection to refer the formation in question to the miocene period. 
I claim to have made this discovery solely by my own investigations. 
Post-Pliocene Period. 
Upper Tertiary Formation. —About one mile south of Hopewell’s Landing, on the 
No. 2. 16 
