132 



were found in the osteology of the Gars, but of these he proposes 

 to speak in a future communication. 



Dr. Abbot laid on the table a mounted specimen of Nu- 

 menius Hudsonicus, Hudsonian Curlew, shot in Chelsea, 

 Mass., in the month of May. This breeds so far north that 

 its nest and eggs are unknown. It is not uncommon here 

 in its northern and southern migrations, flying in small 

 flocks. 



Mr. Bouve presented a specimen of Chalcedony, found 

 by him at Nahant. 



This mineral has not been found heretofore in the trap-rocks of 

 this vicinity. Prof. Hitchcock, in his Survey of the Geology of 

 Massachusetts, notes this fact as singular, since Chalcedony is of 

 frequent occurrence in similar rocks, in the western part of the 

 State. 



ADDITIONS TO THE LIBRARY. 



Wallich, N. Plantae Asiaticae Rariores. 3 vols. Folio. London. 

 1830. J. P. Cushing, Esq. 



Silliman's Amer. Journal of Science and Arts. No. 1. Vol. XLV. 

 8vo. New Haven. 1843. Editors. 



July 19^, 1843. 



Regular meeting — the President in the Chair. 



Dr. Gould read a notice of " Monograph of the Fresh- 

 water Univalve Mollusca of the U. S., by S. S. Haldeman. 

 No. 6. Genus Physa." 



M This number, in its mechanical execution, fully sustains the 

 reputation of the preceding numbers of this beautiful work. The 

 author has seen fit to change the title of the work, for reasons, 

 which would seem insufficient, on account of the perplexity in re- 

 ference which will ensue. It is very doubtful whether he has suc- 

 ceeded in defining the limits of the very variable species of this 

 genus. In illustration of this, there needs only to be mentioned 



