CONTENTS. 
Structural abnormalities in Copopeda (with plate X), 
C. Divighlt Marsh, 195 
Braptomus Qoloradensis, sp. Nov. (with plate X), . 
0. Dwight Marsh, 197 
The Molluscan fauna of Tomahawk lake, ’Wisconsin 
(with plates XI-XYI and one table), 
Frank Collins Baker, 200 
