Looe yea Never was the d ae at f lified teach d 
butions from Walker Museum ee or ten Years we have given oie fan ace 
i -~ } t 
ie ) Vol. IL. No. 5 arateeae Peete rite for our free literature. State 
Co-operative Instructors’ Association 
The Flora. ’, Marion . Indiana 
a” the Eagle Creek WATER REPTILES OF THE 
Formation PAST AND PRESENT 
‘By RALPH W. CH eens : By SAMUEL WENDELL WILLISTON 
Late Professor of Paleontology in the 
University of Chicago 
§ The Eagle Creek formation is 
. Professor Williston, who is widely known as a 
‘d exposed along the bottom of the student of extinct reptiles and as the author of 
m: Columbia River gorge on the Ore- American Permian Vertebrates, which has now 
P- “i become a standard work, presents in this new 
% ‘gon side. It is the oldest forma : volume a summary, divested as far as possible of 
a tion in ther egion. ; unnecessary scientific details, of our present 
4 - knowledge concerning the reptiles of the seas, 
a g The monograph contains a num- lakes, and rivers of past and degaee times. 
a The numerous illustrations, in large part from 
a of ees tables, and nearly ; the pen or brush of the author himself, include 
a hundred haittones. ‘ not only living types and twenty-four restorations 
i" ws 5 of extinct forms, but also many figures elucidat- 
Paper, $1.00, postpaid $1.10 ing the structures and habits of the animals. 
viii+252 pages, royal 8vo, cloth; $3.00, postpaid $3.20 
~ILUNOIS The University of Chicago Press 
Chicago - - Illinois 
; ce : Cambridge Aniversity Press 
B Foceil Plants. A Text-Book for Students of Botany and Geology 
‘ By A. C. S—Ewarp, M.A., F.R.S. In4vols. Demy 8vo. Vol. I. With 112 illustrations 
$4.80. Vol. If. With 266 illustrations. $7.00. Vol. HI. With 253 illustrations. $8.00 
Vol. IV. With 190 illustrations. $9.00. 
_ Paleontology—Invertebrate. By Henry Woops, M.A,, F. G. S. Crown eral Fifth | 
edition. Revised and enlarged, with 173, illustrations. $5.00. 
F Petrology for Students: an lntrodwetion to the Study of : Rocks under 
the Microscope. By Atrrep Harker, M.A., F.R.S., F.G.S. » Fifth edition, revised. 
= . Crown 8vo. $3, 40. 
A Treatise on Crystallography. By W. J. Lewis, M.A. Demy 8vo. $6.40. _ 
4 The Principles of Stratigraphical oe By J. E. fo. ScD., F.R.S., F.G.S. 
Crown 8vo. $3.40. 
_ An Introduction to Geology. _ By J. E. Marr, Sc.D., F-R.S., F.G.S. Crown 8vo. 
$1.80. ; 
ublished by the Cambridge University Press. (England) 
The Macmillan Co., Agents i in the United States 
64 and 66 Fifth Avenue, New York City 
