168 : General Notes. [ Feb. 
Packard, A. S.—The Organ of Smell in the Arthropoda. - Ext. Am. Nat., 1886. 
From the author 
Dimmock, Geo. Eeer dæ and some other Fish- wees. A ig Ext. Rep. 
Fish and Game Commissioners of Mass., 1886. From the 
Fleischmann, Albert—Ueber die erste Anlage der Placenta fa: re Riibthieréa 
Ext. Sitz. Phys. Med. Soc. Erlangen, 1886.—Zur POE der 
Raubthiere. Ext. Biol. Centralbl., vii., 1887. From the author. 
Nee, G. Frederick —The Muir Glacier. Ext. Am. po Sci.; 1887. From the 
uthor 
Pilar, Rob ert.—Nomenclature of Colors for Naturalists, and Compendium of la 
oe open for Ornithologists. Boston: Little, Brown & Co., 1886. Fro 
meee fom ote Morton Laboratory in the University of Caneeess vol. ii., 
part 2; vol. iii., From the Balfour Libra 
Meinert, Fr. —Myria aa p i Hau unensis; iii., Chilo opoda. E Vid. Medd. f. 
d. Naturrh. Foren. Kobita, 1884 (188 6). From the a : 
Stuxberg, Anton.—Faunan pa och Kring Novaja Semlja. accel 1886. From 
the author. 
Sowers Paul.—Notice sur un Crustacé de la craie bliss des environs de Mons. 
otice sur un Crustacé des pe npa a Groa nis —Note sur la présence de 
Can adina desmaresti dans les de la Meuse.—Notice sur les Mollusques 
recueillis par M. le Pa ary Storms dan oh régi ion du Tanganyka.—Notice sur 
les Crustacés és Décapod n Maeitiid du Tabon: Ext. Bulletin. Mus. 
Roy. d’Hists Nat. fisece iv., 1885-1886. From the author 
Shufetdt R. W.—Bibliographical résumé of the writings of R. W. Shufeldt, M. D. 
New York, 1887. From the author 
GENERAL NOTES. 
GEOLOGY AND PALZZONTOLOGY. 
Notes upon Warping of the Earth’s Crust in its Relation to 
the Origin of the Basins of the Great Lakes.—Evidence of 
unequal oscillation of continental areas, producing warping of 
the crust of the earth in the ppi of the Mississippi and in the 
basins of the Great Lakes, is of importance. Numerous borings 
have been made by the Mississippi River Commission—alor 
the course of the Mississippi River, and on its flood-plains be- 
tween Lake Providence, La., and New Madrid, Mo.—that have 
passed through the alluvium and entered the Li ignitic clays, 
which Mr. Wilson (of the Commission) identified as those of the 
I (Eocene) group of Professor Hilgard. 
measurements of these borings, given in the Report of 
: a premet for 1881, I have found that the slope of the bed 
_ of the preglacial valley, for a distance of three hundred miles 
below nor Mamia, is only 0.41 foot Beds age while that of the 
ce and | the e Gulf the sio e ike terion in only : 
