BOSTON 



JOURNAL OF NATURAL HISTORY. 



VOLUME VII. — NO. 11. 



The lateness of the issue of the present number is occasioned by 



delay in the preparation of plates to illustrate one of the articles ; 



it is now deemed advisable to issue it at once, hoping that the 



plates may appear in a subsequent number. Extra copies of the 



separate articles were furnished to their authors at the dates borne 



by the signatures. 



Pub. Com. 



Dec. 1862. 



done to a considerable extent in the reports of Dr. D. D. 

 Owen, and Prof. James Hall, and also in some degree by 

 Dr. B. F. Shumard, and Messrs. Norwood and Pratten. 

 But in consequence of the limited time that either of 

 these gentlemen could give to any one locality, many of 

 the details and minor facts were omitted, and among these 

 are some which have since assumed more importance than 

 they were formerly supposed to possess. Later discover- 

 ies, also, show an intimate and interesting relation to exist 

 between the lower beds, which have upon the best author- 



JOURNAL H. S. N. H. 27 SEPT. 1860. 



