CONTENTS. 



Description of Fresh Water and Land Shells. Read January 15, 1841. - - - 163 



De. Read December 21, 1838. 190 



De. Read October 2, 1840. 191 



Do. Read February 19, 1841. - - - 230 



Do. Read June 18, 1841. 242 



Do. Read October 21, 1842. 246 



