1890.] Geology and Paleontology. 771 
his observations of the New England sand plains are in accordance 
with the generally accepted explanations. 
E. T. Newton has recently described some Eocene siluroid fishes, 
Arius crassus, Arius baroni, and Arius gagorides. (Proc. London Zool. 
Soc., 1889.) 
The Cernaysian Mammalia are reviewed in Proc, Phila. Acad. Sci., 
1890, by H. F. Osborn. The collection is in the private museum of 
Dr. Victor Lemoine, and is not thoroughly known or appreciated 
abroad, except by those who have had the good fortune to examine 
the original types. 
W. B. Clark (Bull. Geol. Soc. Am., Vol. I.) notes the strange com- 
mingling of different faunas in the Tertiary deposits of the Cape 
Fear region. 
In a paper on Glacial Phenomena in Canada, Robert Bell discusses 
the causes of changes in level, and remarks that the elevation of the 
land still in progress in north polar regions indicates that we have passed 
the period of greatest warmth, and that a colder condition has again 
begun to creep upon us from the north. 
G. F. Wright (Bull. Geol. Soc. Am., Vol. L) defines the Oak Knolls, 
a part of the ridge separating Lake Ontario from Lake Huron, as a 
moraine of retrocession. This ridge probably existed as a long island 
“n the great glacial Lake Erie-Ontario. 
T. C. Chamberlin (Bull. Geol. Soc. Am., Vol. I.) presents some 
additional evidences bearing on the interval between the glacial 
epochs. These evidences are the trenching of the valleys of the 
Mississippi, Ohio, Allegheny, Susquehanna, and Delaware Rivers. 
The cutting of these trenches rudely measures the length of the inter- 
glacial interval. j 
At a meeting of the Phila. Acad. Sci., 1888, Otto Meyer deter- 
mined a collection of fossil Tertiary invertebrates imbeded in sand 
which filled the inside of a Balanus convexus Brown, found on the 
west side of Chesapeake Bav. The list comprises 15 Gastropoda, 8 
Lamellibranchiata, 1 Balanide, 1 Ostracoda, 3 Foraminifera. 
R. Lydekker, in a recent paper (Quart. Jour. Geol. Soc., 1890), sub- 
mits sufficient evidence to prove beyond reasonable doubt the occur- 
rence of the striped hyzena in the Tertiary of Val d’ Arno. 
G. M. Dawson calls attention (Geol. Mag., Vol. I.) to the note- 
worthy heights at which glaciation has now been found to occur on 
some of the higher points in the southern interior of British Colum- 
bia. These heights range from 4340 to 7200 feet. 
