Vertebrate Palwontology.— kyerman. 249 
much larger, brackish Baltic sea at the time of departure of the 
Scandinavian ice-sheet and also at the present day. 
As to the extent and geological nature of the uplift, there is a 
very close resemblance between the conditions in North America 
and Seandinayvia. In each country the maximum upheaval has 
taken place in the center of the old Archzean area of denudation 
which forms the nucleus of the continent, and at the same time is 
the tract where the load of the land-ice was heaviest. The 
amount of the upheaval and the ice-load decreased in the same 
directions. Thus the upheaval of the gulf of St. Lawrence was. 
less than of the adjoining tracts on the south and north; and 
this accords with the observations of Mr. Chalmers, who has 
shown that the land-ice moved from all sides toward this depres- 
sion, gradually thinning out there. 
It is also to be remarked that the boundary of the uplifted area 
is pretty nearly coincident with the limit of the last glaciation. 
BIBLIOGRAPHY OF NORTH AMERICAN VERTE- 
BRATE PALASONTOLOGY FOR THE 
YEAR 1891. 
By Joun EyERMAN, Easton, Pa. 
Vertebrate Palszeontology has lost one of its most eminent work- 
ers and authorities in the death of Joseph Leidy, M. D., LL. D. 
For the past forty years Dr. Leidy’s papers on this subject aver- 
aged about six a year, many of these papers being memoirs of 
more than a hundred pages. Many tributes to his memory have 
been written, but the writer calls particular attention to the arti- 
cles by Dr. Henry C. Chapman (Proc. Acad. Nat. Sci., 1891, pt. 
Il, pp. 342-388), Dr. Harrison Allen (‘‘Professor Joseph Leidy: 
His Labors in the field of Vertebrate Anatomy,’ Science 18, Nov. 
13, p. 274) and No. 26 of this Bibliography. 
a. Ami, H. M. See Cope No. e. 
b. Ami, H. M.—See Cope No. f. 
1. Barbour, E. H.—Remains of the Primitive EKlephant 
found in Grinnell, Ia., Science, 16, Nov. 7, 1890, p. 263. 
2. Baur, G.—Notes on some little known American fossil 
Tortoises. Proc. Acad. Nat. Sci., 1891, pp. 411-430. 
3. Baur, G.—On the Characters and Systematic Position of 
the Large Sea-Lizards, Mosasauride. Science, 16, Nov. 7, 1890, 
pp. 262. 
