Editorial Coiinnenf. I'{ 
So much of the drift as remain(-d enghicial when the frontal 
line in its retreat reached the phice of a temporary pause, per- 
mitting a marginal moraine to be formed, was then borne for- 
ward in the manner described to the boundary. 
Onl}" with a rate of ablation much faster and with glacial 
currents much stronger than those of the Arctic regions or of 
the continental ice-sheets during their time of accumulation 
under the severe climate of their high plateau elevation, in 
short, only during the ( 'haniplain epoch, when the land had 
sunk from its preglacial and Glacial altitude both in America 
and Europe, could noteworthy peripheral moraines be amassed. 
They record on each continent the definite closing epoch of 
the Glacial period. 
EDITORIAL COMMENT. 
D.EMONELIX OR WhAT? 
In the midst of the controversy which has arisen over this 
strange Nebraskan fossil may we i-emark that the correct 
spelling of the name adopted is Da' man helix. It may perhaps 
be regretted that a more euphonious form, such as lleJicoda'- 
mon, was not employed from the first, but this not being the 
ease the correct spelling of the term may as well be used. 
E. w. c. 
Keconnoissance Map of the United States. 
In the July number of the American Geologist we published 
a review of a " Reconnoissance map of the United States" by 
Mr. W J McGee. From a recent letter from Mr. McGee, con- 
cerning this review, we quote as follows : " The review con- 
tains several minor errors, which may mislead readers not fa- 
miliar with the history of geologic mapping, and will certainly 
lead to disappointment on the i)art of the many geologists who 
will receive the Fourteenth Annual Report of the United 
States Geological Survey but will not receive the series of 
maps referred to in the notice. The first paragraph of this 
review should have read about as follows: 
"Reconnoissance map of the United States showing the dis- 
tribution of the Geologic Systems sf> far as known * * * 
by W J McGee, 1898. — This map forms plate II of the Four- 
teenth Annual report of the United States Geological Survey 
(for lS92-'93). The scale is about 115 miles to an inch, be- 
