Review of Recent Geological Literature. 237 
The main object of Dr. Brogger's paper is to show that these types 
form a well characterized fauna which he calls the Euloma-Niobe 
fauna and which he says should be separated from the Cambrian and 
united to the Ordovician faunas, chiefly because the majority of the 
genera have an affinity for the genera of the latter system, and that 
comparatively few of the trilobites resemble those of the Cambrian 
system. At the first blush there would seem to be much to recom- 
mend this view, but a similar argument applied to the lower paleozoic 
deposit of the Atlantic border region in North America would sweep 
even the Arenig or Tetragraptus horizon into the Cambrian as the 
Ceratopygi fauna is wanting and the Cambrian types of trilobites are 
the only ones found ez^en in the Tetragraptus beds. The question of 
the assignment of the Euloma-Niobe fauna is not therefore vital in 
this region, but if it prove of more importance than that already 
adopted as the base of the Ordovician, viz: the Tetragraptus Fauna, 
it should be adopted; a change however would involve the re-arrange- 
ment of the collections in many museums as the fauna is now made a 
very comprehensive one. 
The article is accompanied by two page illustrations showing the 
types of the new sub-genera Dikokephalina and Apatokephalus and 
a table showing Dr. Brogger's view of the proper generic reference 
of seventy species of the European forms of this fauna. This article, 
though dated April, 1896, was not received until the summer of 1898. 
G. F. .M. 
• Occttrrence of Fossil Fishes in the Devonian of Iowa. By Cha.'^. 
R. Eastman. Iowa Geol. Sur., Vol. VII, pp. 473-488, 1898. 
A generation ago great activity was shown in the collection of the 
fossil fishes of the Mississippi valley. The wonderful variety of forms, 
and the marvelous abundance of remains excited the interest of every 
paleontologist. Ihe labors of Newberry, St. John and Worthen will 
long be remembered. For more than a score of years, however, the 
subject has been allowed to drop almost out of sight, for during this 
period practically nothing has been done to advance our knowledge 
along this line. 
It is, then, with no small degree of pleasure that the recent revival 
of the interest in the old ichthyic faunas has been noted. Under the 
auspices of the Museum of Comparative Zoology, of Cambridge, Dr. 
Charles R. Eastman has, during the past three years energetically set 
to work to get together all the accumulated fish remains from the 
American Paleozoic, and to study them carefully in the light of the 
latest discoveries. His critical papers, giving the results of some of 
his special investigations, as a part and preliminary to a greater under- 
taking, which is always kept in mind, have appeared with a frequency 
and regularity tliat betokens great enthusiasm, energy and thorouch- 
ness. 
Of the latest contributions that have been issued none is more 
instructive than that on the fossil fishes from the Devonian of Iowa. 
