148 PROCEEDINGS OP THE ACADEMY OF 



May 15th. 

 Mr. Lea, President, in the Chair. 



Fifty-three members present. 



The following papers were presented for publication : 



" Description of a new species of Marginella," by John H. Redfield. 



" Descriptions of new organic remains from the Tertiary, Cretaceous 

 and Jurassic rocks of Nebraska," by F. B. Meek and F. V. Hayden. 



And were referred to Committees. 



Dr. Fisher read the following extract of a letter from Mr. J. H. 

 Kedfield : 



' : Mr. J. R. Willis announces that he has discovered, in deep water off the 

 coast of Nova Scotia, small specimens of the Waldheimia cranium, hitherto known 

 only from Norther i Europe. He has also found Littorina litorea abundant upon 

 the rocky shore? near Halifax, the specimens being perfectly undistinguishable 

 from English examples." 



Prof. R. E. Rogers exhibited a modification of Mr. Gore's apparatus of the 

 metallic ball revolving in a circle under the influence of a galvanic current. 



The apparatus consists of two bands of sheet brass, secured parallel and 

 within an inch and a half of each other, upon the edge of a board, so as to 

 form a miniature railway, on which the ball may rest. 



To give automatic action to the ball, causing it to transverse the rails alter- 

 nately to and fro, the ends of the bands are bent slightly upwards. By this 

 arrangement, the ball, on approaching the end of its course in one direction, is 

 carried by its momentum a little up the inclination, but gravity soon prevail- 

 ing, its motion is reversed, and continues in its new direction until the same 

 result takes place at the other end. 



The death of Bernard Henry, M. D., who died at sea on the 15th 

 April, was announced. 



On motion of Mr. Vaux, the following resolution was unanimously 

 adopted : 



Resolved, That the thanks of this Society be presented to H. Gr. De- 

 silver, for the valuable addition to its collection of the fine specimen of 

 the Moose presented this evening. 



May 22nd. 

 Vice President Bridges in the Chair. 



Forty-four members present. 



The following papers were presented for publication. 



" Catalogue of Birds collected during a survey of a route for a ship 

 canal across the Isthmus of Darien, by order of the Q-overnment of the 

 United States, made by Lieut, N. Michler, U. S. Top. Eng., with 

 notes and descriptions of new species," No. 2, by John Cassin. 



"Descriptions of some new species of Cretaceous Fossils from South 

 America, in the collection of the Academy, by Wm. M. Gabb. 



" Descriptions of 14 new species of Schizostoma, Anculosa, and 

 Lithasia," by Isaac Lea. 



And were referred to Committees. 



[May, 



