42 PROCEEDINGS OF THE AMERICAN ACADEMY 



The following Foreign Honorary Members were elected : — 



In Class I. Section 2, Professor C. A. F. Peters, of Konigs- 

 berg. 



In Class III. Section 1, Professor C. Mittermaier of Heidel- 

 berg. 



In Class III. Section 2, August Boeckh, of Berlin. 



In Class III. Section 2, Professor R. Lepsius, of Berlin. 



In Class III. Section 2, Chevalier Bunsen, Prussian Ambas- 

 sador, London. 



In Class III. Section 3, G. Grote, of England. 



William Raymond Lee was elected a Fellow of the Acade- 

 my, in the Section of Technology and Engineering. 



On motion of Professor Agassiz, it was voted, that the next 

 monthly meeting of the Academy be held on the third Tues- 

 day of June, at half past 7 o'clock, P. M. 



Tbree hundred and eigUty-first meeting. 



June 21, 1853. — Monthly Meeting. 



The President in the chair. 



The Corresponding Secretary read a letter from William 

 Raymond Lee, Esq., accepting membership of the Academy ; 

 and a letter from the Hon. Timothy Walker, of Cincinnati, 

 acknowledging the reception of the resolutions passed at the 

 annual meeting of the Academy on the death of his brother, 

 Sears C. Walker, Esq. 



Professor Agassiz made a communication on the family of 

 Cyprinodonts, of which he had discovered some new generic 

 forms, and twelve new species, in a recent visit to the South- 

 ern States. The differences between the sexes are often so 

 marked in this family of fishes, that the males and females 

 have been described under distinct genera. At a former meet- 

 ing he had mentioned an error of this kind, and he was now 

 able to correct another. Poecilia and MoUienisia, described 

 as distinct genera by Cuvier and Valenciennes, he had ascer- 

 tained to be the male and female of the same species, the 



