Prof. Bailey on Fossil and Recent Infusoria. 341 



Nature of Specimen. Locality. From whom received. 



1. Carboniferous limestone, , Illinois, D. D. Owen. 



2. Yellowish gray calcareous"] 



sandstone = 3d formation of Mullica Hill, New Jersey, Lt. French, U. S. A. 



upper secondary of Prof. (.Timber Creek, " Mrs. Allen, Gardiner, Me. 



Rogers's Report on New I Near Mt. Holly, " J. W. Bailey. 

 Jersey, J 



3. Green Sand in a Belemnite, New Jersey, J. W. Bailey. 



4. Nummulite limestone and ? r^i -u -di «• a i u t\ i i, ti «,, 



„tv,„- c„„„- > Claiborne Bluff, Alabama, Dr. John 1 orrey. 



other specimens, J ' ' •' 



5. " Rotten limestone," Prairie Bluff, " Lt. G. W. Rains, U. S. A. 



6. Marl and limestone, Selma, " " " " " 



7. Yellow and gray calcareous ) Cretaceous formations on ) r pr Tai(>„]ig* 



marl, \ Missouri River, S ' 



( Mission station, northern ^ 



8. Gray calcareous marl, } part of the State of Mis- > B. Silliman, Jr. 



( sissippi, ) 



9. Marl, with Exogyra costaia, Cretaceous formation, S. C. M. Tuomey, Esq. 



10. Borings of Artesian well, Columbus, Mississippi, B. Silliman, Jr. 



11. Cretaceous marl, Mc Naer's County, Tenn. D. D. Owen. 



" " White Cliffs, Arkansas. 



12. Borings of Artesian well, Charleston, South Carolina, Dr. J. Lawrence Smith. 



13. Tertiary marl, Oregon Territory, J. D. Dana, Esq. 



14. Eocene marl, Pamunkey River, Virginia, Mr. Tuomey. 



" " Fort Washington, " Prof. W. B. Rogers. 



15. Matrix of bones of Zygodon, , Alabama, Mr. Buckley. 



16. Meiocene marl, Petersburg, Virginia, Mr. Tuomey. 



17. " " Pamunkey River, " " " 



18. " " Wilmington,NorthCarolina, J. D.Hodge. 



19. " " North Carolina, Mr. Tuomey, 



20. Post pleiocene, South Carolina, " " 



Without anticipating the results of Ehrenberg's examination 

 of the above materials, I may be allowed to state, as the result 

 of my own observations, 



1st. That all these specimens abound in Polythalamia, and 

 that they are remarkably abundant and beautifully preserved in 

 the specimens from Charleston, S. C, Petersburg, Va., Pamun- 

 key River, Va., and in Mr. Nicollet's specimens from the Missouri 

 River. 



2d. The specimens from Fort Washington presented me with 

 what I believe have never before been noticed, viz. distinct casts 

 of Polythalamia. That these minute and perishable shells 

 should, when destroyed by chemical changes, ever leave behind 

 them indestructible memorials of their existence, was scarcely to 

 be expected, yet these casts of Polythalamia are abundant and 

 easily to be recognized in some of the eocene marls from Fort 

 Washington. A figure of one of these casts is given in fig. 30. 



3d. The groups of Polythalamian forms in the different geolo- 

 gical formations of North America are remarkably distinct, and 

 when they have been properly studied and the characteristic 



Vol. xLvin, No. 2.— Jan.-March, 1845. 44 



