1888.] NATURAL SCIENCES OF PHILADELPHIA. 83 



able to say whether they bred there or not, aud until this is proven 

 it is not possil)le to say that they have become perfectly adapted to 

 the new condition of life. Many observers have noticed that Coe- 

 lenterata move up rivers, but this is an interesting case, as the transi- 

 ition from the salt to the fresh water must have been very sudden. 

 At the time of observation Dr. Sharp said that on drinking the 

 water he could not notice the slightest trace of salt. 



Messrs Henry A. Pilsbry and S. G. Morton Montgomery were 

 elected members. 



The following papers were ordered to be printed : — 



