CONTENTS 
The genus Calapoecia Billings 
Species and varieties 
Doubtful and spurious species 
Variations in Calapoecia 
Relationships of Calapoecia 
Stratigraphical and geographical range 
Summary 
References cited 
Page 
1 
5 
18 
21 
23 
29 
35 
36 
IlluBtrations 
Plates I-IV 43-49 
Figure 1. Calapoecia canadensis Billings 9 
11476—11 
