512 The American Naturalist. [June, 
C. rotunda. The first is of interest as being the only Australian Tri- 
lobite in which the supposed auditory organs have been observed. 
These pores in C. yassensis are not situated in the facial sutures, but 
between them and the front rounded border of the glabella. 
The Illinois State Museum has just issued a Bull. (No. 3, 1894) 
containing descriptions of new species of Invertebrates from the Pale- 
ozoic rocks of Illinois and adjacent States, described by Messrs. 8. A. 
Miller and Wm. F. Gurley. The fossils comprise 4 species of Echin- 
ida, 49 Crinoidea and 4 Crustacea, referred respectively to 2, 29 and 2 
genera. Eight page plates of drawings accompany the text, some of 
which are not as well executed as one would wish. 
Mesozorc.—In a revision of the genus Cycadeoidea Buckland, Dr. 
Lester Ward refers to the collection of six fine cycadean trunks 
recently found near Hot Springs, South Dakota. All the cycadean 
remains thus far found in the southern part of the Black Hills occur 
in the area marked by Professor Newton as Dakota Group. The fact 
that no cycadean vegetation has yet been found in the extensive col- 
lections from the Dakota group of Kansas and Nebraska, led to a careful 
examination of the series thus classed by Professor Newton, which 
results in the following conclusion. The Dakota group of Newton is 
much more extensive than No. 1 of Meek and Hayden, and while the 
upper portion certainly belongs to the true Dakota, the lower portion 
very probably extends to near the base of the Cretaceous. The cyca- 
dean trunks belong to this lower portion, and may not differ greatly in 
age from those found in Maryland described by Tyson. (Proceeds. 
Biol. Soc. Wash., Vol. IX, 1894). 
A collection of Cretaceous plants from Vancouver Island yields 
50 species of which 27 are new. These are described and figured by 
Sir Wm. Dawson in Trans. Roy. Soc. Canada, Sect. IV, 1893. In this 
connection the author points out the value of fossil plants as indicators 
of climate and time. 
Cenozoic.—A restoration of Aceratherium fossiger Cope has been 
made under the direction of Professor Williston for the Kansas Uni 
versity Museum. The skeleton isa “ composite ” made up, probably, 
of nearly as many individuals as there are bones. The different ele- 
ments were selected from among many hundreds of specimens obtained 
from a fresh water Pliocene deposit near Long Island, Kansas. The 
i 
