Catalogue of Land and Fresh Water Shells. 



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66. Unio varicosa, Barn. 



L. 4, H. 23/8, Very close to No. 6 but longer and grows 

 larger. 



67. Unio verrucosa, Barn. 



Compressed variety of No. 28. 



Sub-genus, Margaritana. 

 Teeth defective, especially the lateral. 



68. Margaritana complanata, Barn. 



L. 6^, H. 43^. Compressed, resembles No. 1 but nacre 

 white. 



69. Margaritana confragosa, Say. 



L. 3, H. 23/&. Rough on beaks, undulate on posterior. 



70. Margaritana dehiscens, Say. 



L. 2^, H. 1 Rayed with dark green. 



71. Margaritana deltoidea, Lea. 



L. 1%, H. 1. Rayed with green stripes, wrinkled on beaks. 



72. Margaritana marginata, Lea. 



L. 3^, H. 2. Shape of No. 62, wrinkled on beaks- 



73. Margaritana monodonta, Say. 



L. 4, H. \]/ 2 . Black, with one prominent tooth in right valve 



74. Margaritana rugosa, Lea. 



L. 3^, H. 2. Compressed, wrinkled on posterior. 



Sub-genus, Anodonta. 



No teeth. 



75. Anodonta plana, Lea. 



L. 4^, H. 3. Ventricose, green, beautifully rayed. 



76. Anodonta decora, Lea. Young of No. 75. 



77. Anodonta edentula Lea. 



L. 3, H. 1 3^. Dark, abrupt on posterior. Shell heaviest of 

 anodonta group. 



78. Anodonta ferussaciana, Lea. 



L. 2^, H. 1 3/6. Cylindrical, beaks prominent. 



79. Anodonta imbecillis, Say. 



Like No. 78, but beaks very minute. 



