1889. | NEW YORK ACADEMY OF SCIENCES. 163 
water bivalves of our rivers and lakes. Shells and pearls of 
Unio, Anodon, Margaritana, etc., of many species and varied 
tints, are here brought together, and form a very interesting ex- 
hibit of the yield of these beautiful objects by the ‘‘ river 
mussels” so abundant in the United States. 
April 15, 1889. 
STATED MEETING. 
The President, Dr. NEWBERRY, in the chair. 
Fifty persons present. 
The fifth lecture of the Public Course was delivered, upon 
GLACIAL MORAINES IN THE FRONT RANGE, COLORADO, 
by Mr. Freperick H. Cuapin, of Hartford, Conn. 
[Illustrated with an extensive series of lantern views taken 
by the lecturer during his travels among the mountains re- 
ferred to. } 
Dr. NEWBERRY added some remarks in regard to the eroding 
power of ice, as shown in the great moraines observed by him in 
British America. 
A unanimous vote of thanks was tendered to Mr. CHAPIN. 
April 22, 1889. 
STaTED MEETING. 
The President, Dk. NEWBERRY, in the chair. 
Twenty-one persons present. 
Dr. J. J. FrrepricH exhibited a number of specimens from 
the shell-mounds of Cedar Keys, Florida, consisting chiefly of 
shells. He had been unable to find a trace of implements, un- 
