LETTER OF TRANSMITTAL. 



Cambridge, Mass., 



May 25, 1880. 



Sir : I have the honor to transmit herewith for approval 



and for publication the " History of North American Pinnipeds," 



being a monograph of the Walruses, Sea-Lions, Sea-Bears, and 



Seals of North America. 



Very respectfully, your obedient servant, 



J. A. ALLEN. 



F. V. Hayden, 



Washington, J). C. 



vn 



