MARYLAND GEOLOGICAL SURVEY 19 



which has been rendered by the several experts who have contributed to 

 this volume, also to the IT. S. Geological Survey and the U. S. National 

 Museum. Many important suggestions have also been received from 

 Dr. W. H. Dall of the latter institution. A large number of the draw- 

 ings with which the report is illustrated were prepared by the late 

 Dr. J. C. McConnell, and like all of his work, are unrivalled in the field 

 of paleontological illustration. 



