June, 1842.] 181 



Porphyris smaregdinus. Anas Egyptiacus. 



Recurvirostra . Fulica cristata. 



Tringa pugnans. Gallinula Chlorops. 



A Collection of Insects, from Mr. Charles W. Twigg, of New 

 Harmony, Indiana. 



Mass of Sandstone, from the neighbourhood of Plymouth, 

 Pennsylvania, containing nodules of the same substance, in 

 cavities. From Dr. Hiram Corson, of Plymouth. 



DONATIONS TO LIBRARY. 



Second Bulletin of the National Institution for the Promotion 

 of Science. March 1841, to February, 1842. Washing- 

 ton, 1842. From the Society. 



WRITTEN COMMUNICATIONS. 



The Chairman read a letter from Mr. S. S. Haldeman, dated 

 Marietta, Pennsa., May 17, 1842, enclosing communications 

 intended for publication in the Proceedings of the Academy, 

 viz : descriptions of a new Species of Cypris, of two species 

 of Hydrachnse, and of two Entomostraca. 



In this letter Mr. Haldeman stated the singular fact of his 

 having observed, " in a small pond two feet in diameter and 

 two inches deep, no less than thirty species of animal form ; 

 including two Crustacea, four Entomostraca, nine Mollusca, 

 one Annelid, two Hydrachnas, and about a dozen aquatic 

 larvae." 



The communications were referred to a committee, consist- 

 ing of Mr. Phillips, Dr. Goddard and Dr. Morton. 



A letter was also read from Dr. Corson, dated Conshehock- 

 en, June 10, 1842, accompanying his donation. 



VERBAL COMMUNICATIONS. 



Professor Rogers called the attention of the members to the 

 recent earthquake in St. Domingo, remarkable for its severity 

 and the great destruction of life and property. He alluded to 



