174 History of Conchology in the United States. 
Indiana. By J. T. Plummer. 
Illinois. By Robert Kennicott. 
Michigan. By Dr. Abraham Sager. 
Wisconsin. By I, A. Lapham. 
Washington Territory. By Wm. Cooper. 
Lists of the Terrestrial, Fluviatile and Marine Shells of the 
United States have been drawn up by Messrs. W. G. Binney, 
Temple Prime, Isaac Lea, P. P. Carpenter and Wm. Stimpsod, 
which would never have been brought forward, if Dr. DeKay had 
made himself as thoroughly acquainted with his subject as 4 
should have done, before undertaking a work of such magnitude. 
an. my. Our knowledge of the anatomy of our 
terrestrial Mollusca is due almost entirely to the labors of Drs. 
effries Wyman and Joseph Leidy. 
The former has published in the fourth volume of the Boston 
Journal, papers “On the Anatomy of Tebennophorus Caroliniens,, 
and ‘On the Anatomical Structure of Glandina truncata, of . 
Dr. Leidy, of Philadelphia, has carefully investigated 
anatomical ‘structure of our Terrestrial Gasteropoda, and has 
published the results of his labors in the first volume of Bin. 
ney’s Mollusks and in pamphlet. This paper, the preparation" 
which must have cost immense study, is illustrated by some 
the finest anatomical plates ever published in America. “ned 
For the last ten years Dr. Leidy has occasionally descr) °” 
new forms of American Marine and Fluviatile Polyz0a, Bry 
ozoa), and we understand that he is preparing a monograp 
our fluviatile species. d 
Louis Acassiz has given some attention to the anatomy ie 
embryology of our Mollusca. He has several short he sg 
the B ings, 3d vol., and an important article 0p ® 
Embryology of Ascidia in the second volume of Proceedings 
the American Association for the Advancement of Science. ig 
it is understood that a coming volume of | gassiz’s “Co: cual 
butions” will contain an elaborate account of the embryolog" 
