OF ARTS AND SCIENCES. 269 



Three hundred and forty-ninth meeting. 

 August 13, 1851. — (Quarterly Meeting. 



The President in the chair. 



The Corresponding Secretary laid before the Academy a 

 letter of acceptance from Professor Carl Rokitansky, of 

 Vienna. 



The following gentlemen were elected Fellows of the 

 Academy : — 



Professor John H. C. Coffin, of Washington ; 



Waldo J. Burnett, M. D., of Boston ; 



Nathaniel B. Shurtleff, M. D., of Boston. 



Professor Agassiz exhibited some specimens of a new type of 

 Echinoderms ; one of Holothuridas of the genus Orcula, dis- 

 covered on the coast of Maine, near Eastport, which he called 

 Orcula punctata ; one of the genus Synapta, which he called 

 Synapta coriacea ; a gigantic Holothuria from Florida, which 

 he called Holothuria heros ; and a new species of Ophiura, 

 from Eastport, which he called Ophiura acufera. 



Three hundred and tiflieth meeting. 

 October 7, 1851. — Monthly Meeting. 



The President in the chair. 



On motion of Professor Peirce, it was 



" Voted, That every communication to the Academy shall, before 

 being made, be entered by its title in a book to be kept by the Record- 

 ing Secretary for that purpose, and numbered at the discretion of its 

 author, with any number not previously appropriated. 



" Voted, That communications shall be made to the Academy in 

 the order of their numbers, 



" Voted, That members shall be requested to note the time their 

 communications will probably require." 



After some introductory remarks by Professor Peirce, Mr. 

 Blasius communicated to the Academy the results of a very 

 laborious investigation and analysis of the phenomena of the 

 late destructive tornado in the eastern part of Middlesex Coun- 



