10 
LEA, ISAAC, LL.D—(Continued.) 
Descriptions of four new species of Exotic Unionidsx. (Read 
July 5th.) 
New Series, p. 187. July, 1859. 
Change of name of Margaritana Ktawahensis, to M. Georgiana. 
(October 18th.) 
New Series, p. 280. October, 1859. 
Description of a new species of Unio from the Isthmus of Da- 
rien. (Read October 18th.) 
New Series, p. 281. October, 1859. 
Remarks on Embryonic Shells of Uniones. (December 6th.) 
New Series, p. 329. December, 1859. 
Descriptions of three new species of Exotic Uniones. (Read 
December 6th.) 
New Series, p. 331. December, 1859. 
Remarks on the Number of species of Unionide in the United 
States and Territories. (January 24th.) 
New Series, p. 3. January, 1860. 
Remarks on Abnormal Shells. (February 11th.) 
New Series, p. 51. February, 1860. 
Remarks on the Coloring Matter of the Nacre of Uniones, 
(March 20th.) 
New Series, p. 88. March, 1860. 
Descriptions of four new species of Unionide from Brazil and 
Buenos Ayres. (Read March 138th.) 
New Series, p. 89. March, 1860. 
Descriptions of fifteen new species of Uruguayan Unionide. 
(Read March 18th.) 
New Series, p. 90. March, 1860. 
Descriptions of five new species of Uniones from North Ala- 
bama. (Read March 20th.) 
New Series, p. 92. March, 1860, 
Descriptions of four new species of Melaniade of che United 
States. (Read March 20th.) 
New Series, p. 93. March, 1860. 
Remarks on a new form of Palpi of Anodonta. (April 10th.) 
New Series, p. 97. April, 1860. 
