dije Geology and Paleontology. 739 
South African fish most nearly approaches Gyrolepis, from the Euro- 
pean Trias and Rhetic, and Rhabdolepis, from the European Lower 
Permian. (Ann. and Mag. Nat. Hist., September, 1889.) 
Cenozoic.—Mr. Sirodont has been studying the fauna of a Ceno- 
zoic formation at the foot of Mount Dol, on the southeastern side. He 
is of the opinion that the débris there accumulated belongs to a period 
anterior to the movement which elevated the shores of certain regions 
about the Baltic Sea. (Revue Sci., June, 1891.) Mr. E. Riviere 
reports the finding of the teeth and bones of Aguus caballus fossilis, 
Bos primigenius, and a deer as yet undetermined, in the sands of Cergy. 
(Revue Sci., May, 1891.) Dr. Reusch has found glacial striæ and 
boulder clay in Finmark, belonging to a period much older than the 
“ice age.” The ice-marked sandstones are probably Permian, but 
may belong to the Cambro-Silurian series. (Geol. Mag., May, 1891.) 


General.—M. L. Cayeux announces the discovery of an important 
formation of Diatoms in the tufa which contains Cyprina planata in the 
north of France and Belgium. This tufa results from the agglomera- 
tion of sands of the same horizon cemented together by a colloidal or 
chalcedonis silex. -Among the Diatoms which are thus found in great 
numbers the author cites Synedra, Triceratium, and Coscinodiscus. 
(Revue Sct., May, 1891.) Mr. A. Lindenkohl reports a sunken 
river channel in Chesapeake Bay. A narrow and deep channel can be 
traced nearly throughout the entire length of the bay, from the mouth 
of Bush River to that of the Rappahannock, a distance of 120 miles. 
(Am. Jour. Science, June, 1891.) On his return from Koukou-nor, 
while crossing the Nau-Chang, Mr. Martin discovered a large band of 
Jade encased in a rather friable rock. It is true Jade, as fine as that of 
Siberia, and is worked by the natives to make ornaments, often of 
great value, for the Chinese. (Revue Sci., May, 1891.)——As to gla- 
cial records in the Newark system, Mr. I. C. Russell says that after 
personally examining nearly every area occupied by it, he fails to find 
any evidence to support the hypothesis that glaciers assisted in its 
deposition. (Am. Journ. Science, June, 1891.) 



