9 
LEA, ISAAC, LL.D.—(Continued.) 
Descriptions of a new Helix, and two new Planorbes. (Read 
March 234d.) 
New Series, p. 41. March, 1858. 
Remarks on the Soft Parts of Unionide. (May 18th.) 
New Series, p. 114. May, 1858, 
Description of four new Freshwater Mollusks from the Isthmus 
of Darien and Honduras. (Read May.) 
New Series, p.118. May, 1858. 
Remarks on Unio rubiginosus. (June 15th.) 
New Series, p.135. June, 1858. 
Descriptions of seven new species of Margaritana, and four new 
species of Anodonta. (Read June 22d.) 
New Series, p. 138. June, 1858. 
Descriptions of twelve new species of Uniones, and other Fresh- 
water Shells of the United States. (Read July 6th.) 
New Series, p. 165. July, 1858. 
Remarks on Triquetra contorta. (October 12th.) 
New Series, p. 179. October, 1858. 
Description of eight new species of Unionide of Georgia, Mis- 
sissippi, and Texas. (Read April 5th.) 
New Series, p. 112. April, 1859. 
Descriptions of twenty-one new species of Exotic Unionide. 
(Read April 19th.) 
New Series, p. 151. May, 1859. 
Descriptions of two new species of Uniones from Georgia. 
(Read April 19th.) 
New Series, p. 154. May, 1859. 
Descriptions of seven new species of Uniones from South Ca- 
rolina, Florida, Alabama, and Texas. (Read May 10th.) 
New Series, p. 154, May, 1859. 
Description of twelve new species of Uniones from Georgia. 
(Read June 21st.) 
New Series, p. 170. June, 1859. 
Remarks on Dead Shells of Anodonta Lewisii, and Cyclas. 
(July 5th.) 
Now Series, p. 177. July, 1859. 
