AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
Art. XX VI.—Professor Marsh’s Monograph of the 
Dinocerata.* 
THE previous numbers of this Journal have contained all, 
here on record. The extracts which follow have been se- 
lected with a view to give to the reader a brief sketch of the 
discovery, and general characteristics, of this remarkable group 
of mammals, and their relations to other members of the same 
class, living and extinct. 
The general plan of the present volume, essentially the same 
as that of the author’s previous memoir on the Odontornithes, 
1s especially worthy of notice, and might well serve as a model 
for all monographs on similar subjects. In the Introduction, 
the history of the discovery of the Déinocerata, and their dis- 
tribution in time and space, are first presented. A description 
of the various parts of the skeleton in the typical genera of 
the order next itiows richly illustrated, with restorations of — 
two forms, and the biologist has then before him a vivid picture 
of characteristic members of the group. In the Appendix, is 
a ge a of all the known genera and species, with many 
details for the systematic zodlogist. 
* Dinocera. i iganti : 
Othniel Charles Marsh, 96 plates and 200 woodcuts. i-rvili and 231 pp, ta. 
Washington, 18 nited Geological Survey, vol. x. Advance copy 
issued with the permission of the Director. 
Am, Jour. oo Serres, Vou. XXIX. No. 171.—Makcu, 1885. 
