January 1S42.] 143 



STATED MEETING, January, 18, 1842. 

 Vice President Morton in the Chair. 



DONATIONS TO LIBRARY. 



History of the Island of St. Helena, to the year 1823. By T. 

 H. Brooke, Esq. 8vo. London, 1S24. From George D. 



Blaikie, Esq. 



American Journal of Science and Arts, No. 42, for Janu- 

 ary, 1S42. From the Editors. 



Proceedings of the American Philosophical Society, for No- 

 vember and December, 1842. From the Society. 



Vertebra of Icthyosaurus and parts of the paddle bones of the 

 same reptile, from the Lias of Lyme Regis, England : also 

 Vertebra of the Plesiosaurus, and a Pentacrinites, from the 

 same strata. Presented by Dr. S. G. Morton. 



Written Communications. Mr. Haldeman read a paper 

 on three new species of Unionidoe, from the waters of the 

 United States, viz. Unio abacus, U. puniceus, and Anodon 

 plicatus. Referred to a committee. 



Mr. Conrad read some additions to his paper on the Silu- 

 rian and Devonian Fossils read at the last meeting ; which 

 was refeired to a committee. 



Mr. Conrad also read a memoir, "on the Identity of the 

 Middle Cretaceous Formation of the United States, with the 

 Faxoe limestone of Europe." 



Mr. Conrad stated as the result, of mature observation and re- 

 flection, that the medial division of the American cretaceous strata, 

 as seen on Timber creek, in New Jersey, are of the same age 



