THE NATIONAL INSTITUTION. 



185 



miles north of Major B's landing, the clitfs are very high, and the arenaceous fos- 

 silUferous stratum becomes fifteen or twenty feet in thickness, and abounds in large 

 bivalves. The sand is quartzose and incoherent, and has evidently been the undis- 

 turbed bed of the sea ; for we find the bivalves, generally, not only entire, but im- 

 bedded just in tho same position they had lived in when burrowing in their native 

 beds. The large Panopea, so abundant here, is an excellent illustration of this, 

 always having its valves in apposition, and placed vertically, like tho recent MycB 

 of the sand beach beneath. The following list comprises most of the fossils of this 

 locality. Those species which are yet in existence, are indicated by the names 

 being printed in italics : 



Bivalves. 

 Artemis acetabulum, Conrad. 

 Area idonea, Conrad. 

 Anomia ephippium, Lin. 

 Astarte undulata, Conrad. 

 Cytherea Sayana, Conrad. 

 Cytherea marylandica, Conrad. 

 Crassatella marylandica, Conrad, 

 Cardium laqueatum, Conrad. 

 Corbula idonea, Conrad. 

 Diplodonta americana, De France. 



Univalves, 

 Buccinum trivittatum. Say. 

 Dispotsea grandis, Say. 

 Fulgur tuberculatus, Conrad. 

 Fusus rusticus, Conrad. 



Bivalves. 

 Isocardia rustica. Sow. 

 Lucina anodonta. Say. 

 My a praelonga, Conrad. 

 Orbicula lugubris, Conrad. 

 Ferna maxillata. Lam. 

 Pholas ovalis, Say. 

 Fecten Madisonius, Say. 

 Tellina biplicata, Conrad. 

 Venus Mortoni ? Conrad. 



Univalves. 

 Fusus quadricostatus. Say. 

 Natica heros, Say. 

 Naiica duplicata. Say. 

 Terebra simplex. 

 Serpula granifera, Say. 



Fusus parilis, Conrad. 



Coral — Madrepora palmata, Goldfuss. 

 The most interesting deposit of medial tertiary fossils, in St. Mary's county, is 

 in the right bank of the river of that name, where the variety and perfection of the 

 shells have long since attracted collectors and visiters to the spot. The precipitous 

 shore extends at least two miles, interrupted by one small creek, south of which tho 

 following section is presented : 



10 feet. 



2 feet. 



5 feet. 



Mixed sand clay, without fossils. 



Sand and clay, with the same shells as below. 



Lead-colored clay, with — 



3 group of sliells, as given in the lists. 

 2 veins of Turritella plebeia. 

 1 Fanopuia. 



St. Mary's river. 



N, 



