Geological News. 165 
of privilege. The first point is found in a foot-note on page one, 
viz.: “Cope (Vert. of the Tertiaries, p. 195), who regards the out- 
ermost cutting-tooth as an incisor, states that it is absent in Tillo- 
therium and present in Anchippodus, and that in the former there 
are seven and in the latter six cheek-teeth.” This paragraph com- 
mits me to two errors of which I am not guilty. Let “ outermost 
cutting-teeth ” be changed into innermost cutting-teeth, and I am 
correctly quoted. As to the cheek-teeth, I state that my informa- 
tion as to Tillotherium is derived from Marsh, and as to Anchip- 
podus I give the number with a question. The second point I wish 
to refer to is the assertion in a foot-note on page 379, that I state 
“that the inflection (of the mandibular angle) is absent in European 
forms” (of Peratherium). I here referred to the species called 
Oxygomphius by Von Meyer, some of which are true marsupials, 
but others are, according to Schlosser, Talpide. If there be an 
error, it is that of Von Meyer.—£. D. Cope. 
GEOLOGICAL News—GENERAL.—The “American Geologist” 
sends forth its first issue in January, 1888. It announced that it is 
to be a non-partisan publication, open to the properly-worded opin- 
ions of all, from the most powerful to the most obscure, and “ com- 
mitted to no theory whether of construction or obstruction.” Its 
editors and proprietors are Profs. S. Calvin, of Iowa University; E. 
W. Claypole, of Buchtel College; A. E. Hicks, of Nebraska State 
University; N. H. Winchell, of Minnesota University; Dr. 
Persifor Frazer, of Philadelphia; Dr. A. Winchell, of Michigan 
University; and Mr. L. O. Ulrich, of the Geological Survey of 
Illinois 
_ Prof. Claypole utters (American Geologist) a most distinct warn- 
ing to those who, merely because the wish is father to the thought, 
believe the supply of natural gas to be inexhaustible. Natural 
gas, oil, and salt-water are geologically connected, and, where the 
strata are arched upwards, usually collect in the order named. 
After a certain part of the gas has been drawn off the oil will rise, 
and lastly the brine. Many. once productive oil-wells are now 
7 
little more than brine wells, though their age is but twenty years. 
Gregorio Stefanescu, chief of the Geological Survey of 
Roumania, has issued a geological atlas of that country in four- 
teen colored sheets. Diluvial and alluvial strata are largely devel- 
oped, but crystalline rocks occupy the northern portion bordering on 
Transylvania. 
SILURIAN.—Messrs. U. P. and J. F. James publish in the 
Journal of the Cincinnati Society of Natural History a revision of 
