24 



ture, do not correspond in their rate of expansion to that of the 

 quartz and may prove a cause of destruction. 



Prof. Wyman exhibited the shell of a young specimen of 

 Emys punctata. In this specimen the vertebrae and ribs 

 could be made out distinctly, but there were no bony dermal 

 plates ; the osseous structure corresponding strictly to the 

 endo-skeleton of the vertebrata. Prof. Wyman demon- 

 strated on the specimen the correctness of Prof. Owen's 

 views as to the typical character of the appendages of the 

 vertebral column. The scapula was shown to represent a 

 true rib, and the arm an appendage to a rib, not a rib in 

 itself. 



The Secretary read a translation of a letter addressed to 

 him by Prof. Vogt, in reply to the remarks made by Prof. 

 'Agassiz, (see Proceedings, November 12, 1850,) in which 

 it was shown that his classification differed from that of 

 Siebold, in the elevation of Cephalopods to the rank of a 

 Department as well as in some of the subdivisions of the 

 classes, especially those of the Department of Worms. 



The Secretary presented, in the name of Mr. O. V. Hills, 

 of Leominster, Mass., several specimens of minerals from 

 that town, supposed to be Antimony. On examination 

 they were pronounced by Dr. Hayes to be Arsenuret of 

 Iron, although bearing some resemblance to the mineral for 

 which they had been taken. 



A series of specimens of Fiisus islandicus was presented 

 in the name of Mr. James Williams. 



Several fossils from the tertiary deposit in the vicinity of 

 Paris, were presented in the name of Miss Sarah Pratt ; 

 also a number of minerals and fossils from Mr. Arthur 

 Lyman. 



The thanks of the Society were voted to the donors of 

 the above-mentioned specimens. 



