88 LIST OF CONTRIBUTORS. 



Lea, Isaac. Continued. 



Descriptions of twenty-four new species of Unionidae of the 



United States. P '63, 191 



Description of a new genus of the family Melanidae. P '64, 2 



— ' — ■ Description and remarks on Planorbis newberryi. P '64, 3 



Description of eleven new species of indigenous Melanidae. 



P '64, 3 



Descriptions of six new species of Unionidae from Lake 



Nyassa, Central Africa, etc. P. '64, 108 



Description of six new species of Succinea of the United 



States. P '64, 109 



— ■ — ■ Description of a new species of Planorbis. P '64, 111 



■ Descriptions of thirteen new species of Melanidae of the 



United States. P '64, 111 



Description of five new species of Lymneae of North America. 



P '64, 113 



• Descriptions of two new species of Unionidae of South Africa. 



P '64, 113 

 ■ Descriptions of twenty-four new species of Physa of the 



United States and Canada. P '64, 114 



Descriptions of six new species of western Asiatic Unionidae. 



P '64, 285 



Descriptions of three new species of exotic Uniones. P 



'65, 75 



Descriptions of eight new species of Unio of the United 



States. P '65, 88 



Description of twelve new species of Unionidae from South 



America. P '66, 33 



Notes on some members of the feldspar family. P '66, 109 



■ Description of two new species of the genus Lithasia. P 



'66, 133 



On two new minerals from Chester Co., Penna. P '67, 44 



• Descriptions of five new species of Unionidae and one Palu- 



dina of the United States. P '67, 81 



Description of nine species of Unionidae from Lake Nicaragua, 



Central America. P '68, 94 



Description of sixteen new species of the genus Unio of the 



United States. P '68, 143 



Notes on some singular forms of Chinese species of Unio. 



P '68. 145 



Descriptions of four new species of exotic Unionidae. P 



'68, 150 



