148 DONATIONS. 
Lea, Isaac. Observations on the Genus Unio, together with De- 
scriptions of New Species in the Family Unionide, and descrip- 
tions of New Species of the Melanide and Paludine. Vol. xii. 
4to. Philadelphia, 1868. 
Lehigh Coal and Navigation Company. Report of the Board of 
Managers. Philadelphia, 1869. 
Leitner, G. W. Results of Tour in Dardistan, Kashmir, Little Tibet, 
Ladak, Zanskar, &c. Vol.i. Part 1. 
Letter of the President of the National Academy of Sciences, on the 
Operations of that Society for the past year. 1868. rom the 
National Academy of Sciences (Washington, U. 8.). 
Letter of the Vice-President of the National Academy of Sciences, 
on the Proceedings of the Academy during the year 1866. From 
the National Academy of Sciences (Washington, U. S.). 
Linnarsson, J. G.O. On some Fossils found in the EKophyton Sand- 
stone at Lugnés in Sweden. 8vo. Stockholm, 1869. 
Login, T. Roads, Railways, and Canals for India. 8vo. London, 
1869. 
Ludwig, Rudolph. Versuch einer Statistik des Grossherzogthums 
Hessen auf Grundlage der Bodenbeschaftenheit. S8vo. Darmstadt, 
1868. 
Tnitken, C. F, Additamenta ad Historiam Ophiuridarum. Tredie 
Afdeling. 1869. 
Lyman, B.S. Against the supposed former Plasticity of the Pud- 
dingstone Pebbles of Purgatory, Rhode Island. 8vo. Presented 
by Prof. A. Winchell. 
—. On the Link of Gunter’s Chain as the Unit of a Decimal 
System of Weights and Measures. 8vo. From Prof. A. Winchell. 
Marsh, O. C. Description of a New Species of Protichnites from 
the Potsdam Sandstone of New York. 
Merian, Peter. Geognostische Uebersicht des siidlichen Schwarz- 
waldes. Small 8vo. Basel, 1832. Presented by Sir Charles 
Lyell, Bart. 
Merian, Peter. Ueber die Grenze zwischen Jura- und Kreideforma- 
tion. 8vo. Basel, 1868. 
Morris, John. Uead-bearing Districts of the North of England. 
8vo. London, 1869. 
Pourtales, L. F. de. Contributions to the Fauna of the Gulf Stream 
at great Depths (2nd series). 
