1 Cylindrella Gheisbrrchti. 



2 Clausilia tridens. 



3 Cla usiiia A rdonin ia na. 



CYLINDER SHELLS, POND SNAILS, 



4 Megaspira elalior. 



5 CylindreUa Agnesiana. 



6 Slrnfihin ( Cirion) decuniana. 



MIDAS' EAR AND 



7 Auricula auris-MidiF. 



8 Planorbis trivohis. 



9 Circinaria concava. 

 10 Ph\sa gyrina. 



TOOTH SHELLS 



I 1 Limncea stagnalis. 



1 2 Dentalium elephantinum. 



13 Dentalium preliosunt. 



