44 PROCEEDINGS OF THE ACADEMY OF [1883. 



is of rare occurrence in any form of axes or hammers belonging 

 to our American Indians, except in the case of ceremonial weapons. 

 The length of the haft-hole in this mall is four and a half inches; 

 but its width of one inch, which in the drilling from either end 

 toward the centre, narrows to half an inch, does not seem to be 

 sufficient in comparison with its size to warrant the insertion of 

 a handle ; for this reason the speaker was inclined to believe that 

 it was in an unfinished condition. Malls have been found in the 

 ancient copper mines at Keeweenaw Point and Isle Roj^il in Lake 

 Superior without grooves for hafting, and occasionally with double 

 grooves. There are malls in use at present among the Sioux 

 Indians for breaking bones and pounding pemmican, but these are 

 firmly encased in raw hide, except that portion of the head used 

 in striking. The occurrence of this kind of haft-hole, excepting 

 as before stated in the ceremonial weapons, is not often seen, 

 resembling in this respect some of the neolithic malls and hammers 

 of the eastern continent. 



February 13. , 



The President, Dr. Leidy, in the chair. 

 Thirty-three persons present. 



The following papers were presented for publication : — 



"A new Unio from Florida," by Berlin H. Wright. 



" Notes on the Birds of Westmoreland Co., Penna.," by Chas. 

 H. Townsend. 



The Publication Committee reported in favor of publishing the 

 following papers in the Journal of the Academy : — 



" Urnatella gracilis," by Jos. Leidy, M. D. 



" On the Extinct Peccaries of North America," by Jos. Leidy, 

 M. I). 



" The Terrestrial Mollusca inhabiting the Society Islands," by 

 Andrew Garrett. 



Change of Color in a Katydid. — Professor Lewis recorded a 

 curious instance of modification in color in the case of a kat3'did, 

 where the normal light green tint had been rei)laced by a bright 

 scarlet, the complementary color. The insect, which was found at 

 Point Pleasant, N. J., difiters in no way from the common katydid, 

 Cyrlophylluni concavum Sa}', except in the unusual color. 



On the Reproduction and Parasites of Anodonta Jiuviatilis. — 

 Prof. Leidy directed attention to a basketful of living fresh-water 

 mussels, Anodonta jiuviatilis, which were obtained for him through 

 the kindness of Rev. Jesse Y. Burke, and are now placed at the 



