12 
25. An agatized echinus, about the size of a pigeon’s 
egg. From Kentucky. 
26. Several trays, containing moulds of screw-shells, 
entrochites, and terebratulas, from various localities. 
27. A white orthocerite, in dark lime-stone. York, Up- 
per Canada. 
28. The two valves of an oyster, complete, from a stra- 
tum of marine shells. Digges’s Point, river Potomac.— 
General Brown. 
29. A mass of clay, or argillaceous marl, containing 
charcoal; or the specimen may be termed fossil charcoal, 
bedded in clay. Frem Digges’s Point, Potomac. Same 
locality with the preceding article, though lying twenty 
feet below the stratum of marine shells, and fifty-seven 
beneath the surface.—General Brown. 
30. ‘T'wo specimens of the univalve and bivalve marine 
shells, compacted into rock, with littoral sand. From 
Upper Marlborough, Maryland, near the Patuxent River, 
Washington city, and Annapolis. 
31. Large pectinite, with other oceanic relics, in wacke, 
with lac lunze. From the Peruvian Andes, fifteen thousand 
feet about the present level of the sea, where it was found 
by Don Pedro Abbadia, and forwarded. 
$3. A series of specimens, affording an instructive view 
of the orthocerites, chain madreporites, and various mol- 
luscous relics. From Lake Huron.—Major Delafield. 
- 84. A long piece of petrified wood, covered with sili- 
cious crystals. From Weymouth, England. 
35. A polished specimen of marble, aboundine™ in encri- 
nites. England. 
35. Petrified wood, by calcareous carbonate. From 
Sullivan town, Madison county, New-York ; part of a tree 
that had undergone such conversion.—General Pierre Van 
Cortland. 
36. A madreporite, curved like a ram’s horn, of unusinal 
_ figure and magnitude. Coeyman’s, Albany county, New- 
‘York. 
