Thetechnical descriptions of these fossilscompose, the main part of the bulletin,which is of interest especially to thoseconcerned with the study of the extinct molluscan faunas.The: great basin occupied by ?heOnondaga sea was later warped andgreatly changed and its easter-i portions were filled to a thickness of r,000tc 10,000 feet by sediment, mostly 'Jo-rived from the elevated but com para-jtiv