SELLARDS.| Fossil Plants, Upper Paleozoic, Kansas. 389 
lections of the Yale Museum, among which those from Clinton, 
Mo., and the unparalleled representation of the Mazon Creek 
flora have been of especial value because of their relation to 
the lowermost divisions of the Kansas flora. Professor Beech- 
er’s well-known unfailing interest wherever fossils are con- 
cerned, and his advice and direction, have added much to the 
results of the study. The writer has been repeatedly indebted 
from the beginning of these studies to Mr. David White, paleo- 
botanist to the United States Geological Survey, for reference 
to literature and for advice in the determination of specimens, 
as well as for access, often at not a little inconvenience to him- 
self, to the extensive plant collections of the National Museum. 
The later additions to the collections and review of the stra- 
tigraphy of the Permian formations, as well as the completion 
and publication of the paper, has been made possible by the 
interest in the work and the opportunities afforded the writer 
by Professor Erasmus Haworth, Geologist of the State Survey. 
The line drawings were made largely by Mr. S. Prentice. 
