Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 



Vol. LXIII. No. 1. 



A SECTION IN THE TRENTON LIMESTONE AT 

 MARTINSBURG, NEW YORK. 



By Thomas H. Clark. 



With One Plate. 



CAMBRIDGE, MASS., U. S. A.: 



PRINTED FOR THE MUSEUM. 



May, 1919. 



