&am 



Bulletin of the Museum of Comparative Zoology, 



at Harvard College, CAMBRIDGE, Mass. 



VOL. IV. 



THE TERRESTRIAL 



AIR-BREATHING MOLLUSKS 



OP THE 



UNITED STATES AND THE ADJACENT TERRITORIES 

 OF NORTH AMERICA. 



DESCRIBED AND ILLUSTRATED 



BY W. G. BINNEY. 



VOL. V. 



PLATES. 



CAMBRIDGE: 



PRINTED BY WELCH, BIGELOW, AND COMPANY, 



UNIVERSITY PRESS. 



JULY, 1878. 



