Ill 



5-^ inches in length, and I never had a specimen of V. gilvus so 

 small as that." 



I have given Mr. Kumlien's letter in nearly his own language, 

 and in no instance have I varied from his meaning. I think it 

 establishes his vireo to be a good species, and if so, it is the 

 Vireosylvia Philadelphica of Mr. Cassin. 



President Hitchcock exhibited specimens of impres- 

 sions, which he supposed to be those of a Myriapod, 

 found at Turner's Falls on Connecticut River. 



President Hitchcock also presented specimens of de- 

 pressions found in the Sandstone of the Connecticut 

 Valley. They were of regular polygonal forms, gen- 

 erally from five to eight sided, shallow, and about an 

 inch in diameter. Similar depressions have been found 

 in the Niagara Limestone of New York, of two or three 

 feet in diameter. 



Mr. Hitchcock suggested that they might have been made by 

 tadpoles. He had observed these animals in the water contained 

 in the excavations, and had been informed by boys that they had 

 seen tadpoles in the act of excavating them. In 1850, Prof. B. 

 Silliman, .Jr., exhibited similar specimens to the American Asso- 

 ciation for the Advancement of Science, and read a letter from 

 a gentleman suggesting the same explanation of their forma- 

 tion. This explanation Prof. H. had not heard of, until he had 

 conceived the idea himself. 



Mr. Hitchcock further stated that he was now doubtful, if the 

 tracks which he had supposed to have been made by birds, in the 

 Connecticut Valley Sandstone, were really jjroduced by birds, 

 since one great argument, viz : that of the number of phalanges 

 in the toe, is lost. Tracks of an animal, which was certainly a 

 quadruped, are now found, presenting the same number of pha- 

 langes and toes as the dinornis. 



Specimens of Clay Stones were exhibited by Mr. 

 Charles Stodder and Mr. Ambrose Wellington. 



The Committee appointed to memorialize Congress, 



