110 [October, 1841. 



thirds convex, the internal third coneave, with numerous delicate, 



distinct and closely approximated rings, which encircle the whole 



shell. 



One end of this remarkable species has the characteristic curve 

 and septa of the Hamites. The concave surface looks as if de- 

 signed to receive the cylinder of the opposite side. Length nearly 

 one inch. 



Found by Mr. Conrad in the ferruginous sand at the Deep-cut of 

 the Chesapeake and Delaware canal. 



STATED MEETING, October 19, 1841. 

 Vice President Morton in the Chair. 



DONATIONS TO MUSEUM. 



Eggs of sixteen species of birds found in Michigan, July, 1841, 

 by Dr. George C. Leib, and by him presented to the Society, 

 viz. : 



Anas discors, 3. 



boschas, 14. 



Fulica Americana, 16. 

 Galinula galeata, 10. 

 Podiceps Carolinensis, 6. 

 Ardea exilis, 12. 



lentiginosa, 9. 



Turdus felivox, 5. 



migratorius, 8, 



rufus, 1. 



Icterus phaeniceus, 4. 

 Cocyrus erythropthalmus, 15. 

 Quiscalus versicolor, 11. 

 Sturnus ludovicianus, .2. 

 Ortyx virginianus, 7. 

 Muscicapa tyrannus, 13. 



