INDEX TO GENERA AND SPECIES. 



337 



Thecidium Barretti, 



Mediterraneura 

 pumilum, 

 Trevelyana picta, 

 Trimerella grandis, 

 Tringonosemus elegans, 

 Trjpanostoma affine, 



canaliculatum, 



curtum, 



gradatum, 



ligatum, 



parvum, 



ponderosum, 



undulatum. 



Unio Barnesianus, 

 caperatus, 

 ebenus. 



151 

 151 

 148 



301 

 160 

 114 



224 

 224 

 224 



225 

 225 

 225 

 225 

 225 



217 



217 



218 



Yoldia eufalensis, 74 



Zonites implicans, 307 



umbratilfs, 307 



