440 
PROCEEDINGS OF THE ACADEMY OF 
November 16. 
The President, Dr. Ruschenberger, in the chair. 
Twenty-seven members present. 
The following papers were presented for publication : — 
“ Descriptions of New Fossil Shells from the Tertiary of Califor- 
nia.” By R. E. C. Stearns. 
“ A Descriptive Catalogue of Scalidae of theWest India Islands.” 
By 0. A. L. Morch. 
On TrichocephoMs affinis, Dies. — Dr. Chapman noticed having 
found in the intestine of the llama the Trichocephalus affinis de- 
scribed by Diesing as occurring in the camel, and observed that 
it was interesting to find the same intestinal worm in animals so 
closely related structurally, though so widely separated geogra- 
phically. 
On the Castor Glands of the Beaver. — Dr. Chapman also called 
attention to the arrangement of the castor glands in the American 
beaver, the lower symmetrical glands opening into the ano-pre- 
putial passage consisting of only two glands, whereas the European 
species in this respect exhibited three. 
November 23. 
The President, Dr. Ruschenberger, in the chair. 
Seventeen members present. 
On the Mesozoic Red Sandstone of the Atlantic States. — Prof. 
Persifor Frazer, Jr., said that the art of stratigraphy has proved 
itself capable of most wonderful extension, and has given the 
foundation for whatever of exactitude of statement can be claimed 
for geology. 
It is another instance of the surprising lengths to which proba- 
bility can be carried by inductive reasoning based on compara- 
tively few but generally admitted premises. It is surprising to 
read over the results of the application of this method in any 
general outline of geology, and to note that mere relative position 
of things can unfold to us a marvellous story of motion, and 
evolution or successive changes, according to law. 
The more facts we know the wider is the range of this applica- 
tion, and sometimes one very little fact well established will require 
vast continents to be plunged in the imagination thousands of feet 
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