476 The American Naturalist. [May, 
latter which are quite dissimilar from Apus and the higher crustacea, 
and the exact relations of the trilobite with any one group cannot be 
considered as fixed. Points of likeness may be established with almost 
every order, showing chiefly the relationship between the trilobite and 
the ancestors of the modern Crustacea. (Amer. Geol., Vol. XV, 
1895.) 
Land Animals of the Canadian Paleozoic.—The paucity of 
fossil remains of land animals in the older rocks renders the finding of 
new material of special importance. Accordingly, the announcement 
by Sir William Dawson of the discovery of a number of Paleozoic air- 
breathing animals is of great interest. Forty-three individuals, re- 
presenting a number of species, have been taken from the interior of 
two erect trees in the Joggins Coal Mine—the same locality in which 
the first known Paleozoic land snail was found in 1851. 
Descriptions of these remains are embodied by Sir William Dawson 
in a Synopsis of Air-breathing Animals of the Paleozoic in Canada, up 
to 1894. The Synopsis contains references to the publications in which 
the various species have been described, and to their localities, discover- 
ers, and dates of discovery and description. The species described in 
the Synopsis are distributed as follows: 
Vertebrata 26; all Batrachia. 
Arthropoda 33; viz., Insects, Scorpions, Myriapods. 
Mollusca 5; Pulmonate Snails. 
Four of the vertebrate species are named for the first time in this 
paper—two from osseous remains, and two from foct-prints. 
The paper concludes with a note of advice to collectors as to where 
and how to obtain this valuable Paleozoic material. (Trans. Roy. Soc. 
Canada, Sect. IV, 1894.) 
The Devonian System of Eastern Pennsylvania and 
New York.—In a paper containing an account of a field investiga- 
tion of the Devonian system of eastern Pennsylvania and New York, 
Mr. Prosser takes exception to the terms used by the Pennsylvania Geo- 
logical Survey and proposes certain changes to bring the correlation of 
the Pennsylvania section nearer to that of New York. From paleon- 
tological data Mr. Prosser has been enabled to compare the formations 
of this region with the typical sections of the Devonian system of 
Central New York. 
Mr. Prosser finds the Marcellus shale clearly defined, the Hamilton 
(of White) the Genesee shale (of White) and Tully limestone (of 
