1893.] Recent Literature. 1079 
The Mesozoic Echinodermata of the United States.'— 
This volume, Bulletin No 97 of the U. S. Geological Survey, is the 
first of a series of reports on American fossil Echinoderms prepared by 
Dr. William B. Clark. It comprises a systematic review of the Mesozoic 
Echinodermata of the U. S. in which descriptions of moderate length 
are accorded the different species; a complete bibliography of the sub- 
ject; a table showing the geographical range of the American species ; 
and catalogue of the specific names. 
Fifty plates illustrate all the species accompany the report, and,. 
according to the author they show many details of structure not 
recorded in the descriptive portion. 
The Flora of the Dakota Group.'—-This memoir in quarto 
form was in preparation by Prof. Lesquereux at the time of his death. 
Tt was, however, so nearly completed that it has been published with 
but slight changes from the original wording. The work is limited to 
the description of fossil plants represented by a large number of speci- 
mens obtained at different localities of the Dakota Group, especially in 
Kansas, and to the evidence derived from the character of the plants 
in regard to their origin, their relations, and their places in the history 
of the vegetation of the wor 
The original manuscript aboa descriptions and figures ef 350 
species of plants, but before it could be published, extensive additional 
collections were made in Kansas. This new material was identified 
and described by Prof. Lesquereux, and incorporated in the mono- 
graph. It added 110 species to the list, making in all 460 species now 
known from the Dakota Group. 
The drawings which accompany the work are life size and occupy 66 
A short account of the life and work of Prof. Lesquereux is given 
by the Editor in his preface. 
Fritsch’s Fauna of the Gaskohle of Bohemia. *—The impor- 
tant fauna of the Permian formation receives further illustration from 
_the parts of Dr. Fritsch’s great work last issued. The first and second 
4 Bulletin of the'United States Geol. Surv., No.97. The Mesozoic Echinodermata 
of the United States. By William Bullock Clark, Washington, 1 
phs of the U. S. Geol. Surv., Vol. XVII. The Flora of the Dakota Group. 
A Posthumous Work by Leo Lesquereux,. Edited by F. H. Knowlton, Washington, 
1892. 
ê Fauna der Gaskohle und Kalksteine der Permformations Bóhmen's, von Anton 
Fritsch; Band II, H. 4, 1889 and Band III, Hefts 1 and 2, 1890, 1893. Prague. 
