+ INTRODUCTION. 
American students being Hastman’s translation of “Zittel’s Text-Book 
of Paleontology,” published by Macmillan & Company. 
Most of the drawings accompanying Part II. have been prepared 
by Miss Mildred L. Marvin. A few have been made by Miss Annie 
L. Weller and Mr. D. F. Higgins, and the writer himself has con- 
tributed a small number. 
