24 LIST OP CONTRIBUTORS. 



Conrad, Timothy Abbott. Continued. 



■ Observations on the lead bearing limestone of Wisconsin and 



description of a new genus of trilobite and fifteen new Silurian 



fossils. P '42, 329 

 Descriptions of a new genus and twenty-nine new Miocene 



and one Eocene fossil shells of the United States. P '43, 305 

 — Descriptions of nineteen species of Tertiary fossils of Vir- 

 ginia and North Carolina. P '43, 323 

 — • Descriptions of eight new fossil shells of the United States. 



P '44, 173 



— Descriptions of new species of fossil and recent shells and 

 corals. P '46, 19 



— Observations on the Eocene formation, and descriptions of 



one hundred and five new fossils of that period from the vicinity 

 of Vicksburg, Mississippi. P '47, 280 



— Descriptions of two new genera and new species of recent 

 shells, etc. P '48, 121 



— Descriptions of new freshwater and marine shells. P '49, 



152 



— Remarks on the Tertiary strata of St. Domingo and Vicks- 

 burg, Miss. P '52, 198 



— Notes on shells, with descriptions of new species. P '52, 199 



— A synopsis of the family of the Naiades of North America, 



with notes and a table of some of the genera and sub-genera of 

 the family, according to their geographical distribution, and de- 

 scriptions of genera and subgenera, P '53, 243 



— Synopsis of the genus Cassidula Humph, and of a proposed 

 new genus Athleta. P '53, 448 



— Omissions and corrections to the "Synopsis of the North 



American Naiades.'' P '53, 449 



— Rectification of the generic names of Tertiary fossil shells. 

 P '54, 29 



— Notes on shells, with descriptions of three recent and one 



fossil species. P '54, 31 



— Descriptions of three new species of Unio. P '55, 256 

 Descriptions of 18 new Cretaceous and Tertiary fossils. P 



'55, 265 



— Observations on the Eocene deposit of Jackson, Miss., with 



descriptions of 34 new species of shells and corals. P '55, 257 

 • Descriptions of a new species of Melania. P '55, 269 

 Description of ;i new species of Pentamerus. P '55, 441 



