1892. | NEW YORK ACADEMY OF SCIENCES. 17 
active owing to injuries received during the operation of secur- 
ing artificial entrapment. 
In conclusion, the observations upon Dionaea suggest in 
summary the following noteworthy characters :— 
I. Specialization for the capture of ground insects. 
II. The marked differences in irritability in individual leaves; 
the usual inability of the plant to capture and retain larger and 
more active insects ; the usual failure of the plant to capture 
transient insects ; the repeated closings of the trap upon inor- 
ganic and vegetable objects. 
III. The sensitiveness of the trap in parts other than the 
filiaments. 
1VY. The marked vegetable element of the entrapped-organ- 
isms, suggesting homologies in function with Pinguicula, 
Drosera and Utricularia, a relation more probable when we take 
into consideration the presence of quadrifid processes and their 
occurrence upon the underside of the trap. 
Cotumpia CoLiecE, Oct. 16, 1892. 
“Note on a species of Hieracium,’’ by N, L. Britton. 
«* Artificial production of Twins and Multiple Embryos in Am- 
phioxus,’’ by E. B. Wilson. 
The Fourth paper, The Cretacious Mammalia in the Ameri- 
can Museum of Natural History; to have been presented by 
Professor Osborn, was deferred until the following, meeting of 
the Section. 
Professor Britton exhibited an Indian net-sinker about ten 
inches in length that he had found on Manhattan Island. The 
finding of similar relics during the excavations for the new ship 
canal was noted. These had been found associated with the 
plates of the Sturgeon. 
The meeting adjourned. 
