1 90 Natural History of the Grayling. 



fish, prior to breeding, are known on the Teme as 

 Shutts or Shots. Salviani says the name Umbra is 

 derived from the fish being a very swift swimmer, 

 disappears like a shadow. 



Much has been written about the use of the large 

 dorsal fin. Dr. Day says: "Its large back fin, 

 aided by its well-developed air-bladder, would 

 seem to show that its formation is that best adapted 

 for rapidly rising or sinking in the water." 



FINIS. 



