ILLUSTRATIONS 



PLATES 



FACING PAGE 



I. Ten figures showing structures of Fossotnbronia longiseta and 



one of Aneura multifida major 50 



II. Figures showing structure of Aneura multifida major, Lepi- 

 dozia attenuata, Porella bolanderi, Anthoceros pearsoni, 

 Fegatella conica, Fimbriaria, and Fossombronia longiseta. 50 



FIGURES 



1-8. Cambarus (^Procambarus) cubensis 176-177 



9-12. Cambarus (^Paracatnbarus) paradoxus iSo— 183 



