I. U S. F. C. 1897. (To face page 209.) 
Plate 10. 
LAKE LAMPREY (Petromyzon marinus unicolor De Kay) FROM CAYUGA LAKE, IN WINTER. One-half natural siz 
BROOK LAMPREYS (Lampetra wilderi Gage). Natural size. 
(a) male, and b) female, taken at spawning season and photographed under water with a vertical camera. 
(From Plate IV, in the Wilder Quarter Century Book, by S H. Gage ) 
PICKEREL ( Lucius reticulatus) AND SUCKER ( Catostomus commersonii) WITH LAMPREY SCARS. 
In both cases the wounds penetrate the abdomen. 
(Photographed fresh under water, with a vertical camera.) 
LAKE LAMPREY CLINGING TO THE SUCKER UPON WHICH IT WAS CAUGHT, 
Note the characteristic Lamprey scars by the pectoral and pelvic fins. 
