CONTENTS. 



Part 1— April 4th, 1867. 



Page. 



1. List of Officers and Committees, .... 1 



2. Record of Meetings, ...... 2 



3. Observations on Pleiodon Macmurtrii, by T. A. Conrad, 4 



4. Palaeontological Miscellanies, by T. A. Conrad, . 5 



Note on a Cretaceous Limestone of Dakota. Note on Aturia 

 Mathewsoni — on Corhicula densata, Conrad. Description 

 of a new genus of Pectinidse. 



5. Descriptions of New Genera and Species of Fossil 



Shells, by T. A. Conrad, 8 



6. On the Errors of too Exclusive Classifications, by H. 



Crosse. Translated by Frank Daulte, ... 17 



7. Observations on the Bathymetrical and Geographical 



Distribution of Marine Invertebrate Animals, by J. 

 Gwyn Jeffreys, ....... 26 



8. Description of a new Species of Montacuta, by John 



H. Thomson, 33 



9. Monograph of the Terrestrial Mollusca of the United 



States, by George W. Tryon, Jr. (Continued) . 34 



10. Illustrations of new Species of Partula, by Wm. Harper 



Pease, ........ 81 



11. Notices and Reviews of New Works, by George W. 



Tryon, Jr., 82 



American. — Memoirs of the Boston Society of Natural History. 

 Proceedings of the California Academy of Natural Sci- 

 ences. Journal and Proceedings of the Philadelphia 

 Academy of Natural Sciences. Primes' Monograph of 

 American Corbiculadse. 



