But. U. S. B. F., 1908. 



Plate CX\^I. 



Fig. 5. — Photograph of the iicst of a small-mouthed black bass {Micropterns dolotuien) taken with 

 the aid of a screen, the camera above water. 



Fiti. 6. — Brook lampreys {Lampetra wilderi) on the nest, photographed through the water glass shown in 

 figure 2, plate cxiv, in about 8 inches of running water. 



