86 LIST OF CONTRIBUTORS. 



Lea. Isaac. Continued. 



Descriptions of twenty-one new species of exotic Unionidse. 



P '59, 151 



Descriptions of seven new species of Uniones from South 



Carolina, Florida, Alabama and Texas. P '59, 154 



— Descriptions of two new species of Uniones from Georgia. 

 P '59, 154 



— Notice of Alexander von Humboldt, P '59, 162 



— Descriptions of twelve new species of Uniones from Georgia. 



P '59, 170 



— On Unionida? from Georgia. P '59, 177 



— Descriptions of four new species of exotic Unionidae. P '59, 187 



— On Margaritana etowahensis. P '59, 280 



— Description of a new species of Unio from the Isthmus of 

 Darien. P '59, 281 



— On Unionidse from Indiana. P '59, 329 



- — ■ Descriptions of three new species of exotic Uniones. P '59, 331 



— Biographical note on August E. Jessup. P '60, 1 



— On the history of anthracite. P '60, 2 



— On abnormal shells. P '60, 51 



— On the teeth of Unionidae. P '60, 53 



— On the coloring matter of the nacre of the genus Unio. 



P '60, 88 



— ■ Descriptions of four new species of Unionidse from Brazil 

 and Buenos Aires. P '60, 89 

 — Descriptions of fifteen new species of Uruguayan Unionidae. 



P '60, 90 



— Descriptions of five new species of Uniones from north Ala- 

 bama. P '60, 92 



— Descriptions of four new species of Melanidse of the United 



States. P '60, 93 



— On the palpi of Anodonta. P '60, 97 



— On Mollusca from artesian wells. P '60, 147 



— On Echinus. P '60, 149 



— Descriptions of fourteen new species of Schizostonue, Ali- 

 en losae and Lithasiae. P '60, 186 



— Descriptions of three new species of Uniones from Mexico. 

 P '60, 305 



— Descriptions of two new species of Uniones from Georgia. 



P '60, 305 



— Descriptions of seven new species of Unionidae from the 

 United Stales. P '60, 306 



