598 Annals ok the Carnegif. Museum. 



Ottawa \'alley Regiun. Aylmer Fonnation 557 



Comparison of the Faunas of the Ayhiier Sandstone and Aylmer Limestone. 560 

 Comparison of the Fauna of the Ottawa Region with that of the Champlain 



Region 562 



Conchisions. 



'I'lie Chazy Fauna 562 



Faunal Divisions. 



The Hebertella exfoliata Division 563 



The Machintes viai^iitis Division ; 565 



The Caniarota'chia pLna Division 566 



Canad ian Exposures 567 



The Closing Period of Chazy Time 569 



Representation of Chazy Time in other Kegions. 



The St. Peter Sandstone 571" 



The Stones River Group 572 



The Blue Limestone of Lenoirs, Tennessee 573 



Relation of Divisions I, 2, and 3 to Cushings .Substnges 573 



Description of New Sjiecies. 



Brachiopoda 574 



Gastropoda 575 



Pelecypoda 577 



Bibliography 578 



