60 



membrane. The sack is the ccecum marked g in Dr. Wyman's 

 plate of a dissection of the same animal published in the Society's 

 Journal. On the bottom of the sack, in both individuals, there 

 was a papillary eminence, to the summit of which, in one indi- 

 vidual, was attached the dart. It was about 2 lines in length, 

 shaped like a cock's spur, the point being bent upwards towards 

 the cavity of the neck of the oviduct. It is hollow, and composed 

 of carbonate of lime, effervescing and soluble in weak chloro- 

 hydric acid. 



Dr. Leidy also stated that he had repeatedly seen the dart in 

 Planorbis parvus, but had sought for it in vain in other species. 



DONATIONS TO THE CABINET. 



Collection of fossils from the limestone strata near Louisville, 

 Ky. From Jedediah Cohb, 31. D., Louisville. 



Fossils from the upper Missouri. From T. Sprague, Hingham. 



Two shrew moles, Scalops aquaticus ; one in while pelage. 

 From Joseph Barratt, M. D., Middletown, Conn. 



October I, 1845. 

 Dr. Samuel Cabot, Jun., in the Chair. 



Dr. J. B. S. Jackson read a paper on the fossil bones of 

 Mastodon giganteus, disinterred from a marl pit on 

 Schooley's Mountain, New Jersey, and now exhibiting in 

 this city. 



Dr. Jackson remarked, that the locality where the bones were 

 procured, is fully described in the Proceedings of the American 

 Philosophical Society, D c, 1844. The chief point of interest 

 is the mounted skeleton, this being far more perfect than any 

 that has yet been seen, though less so, it is said, and altogether 

 less interesting, than the one now exhibited in New York ; the 

 feet, the sternum and a few of the caudal vertebrae only are 



