Dentition of Puhnonata. 46 



either margin, those of the centre converging and meeting before reach- 

 ing the lower margin, as in Cylindrella, &c. The jaw appears therefore 

 to^be of the same type as in Bulimulus, Gceotis, Amphibulima, Cylindrella, 

 3Iacroceramus and Pineria. The ribs, however, are in Partula exceed- 



ingly fine. 



The lingual dentition of the species mentioned above is the same as 

 figured by Heynemann (Mall. Blatt. 1867, pi. i, fig. 1,) excepting that I 

 detect distinct cutting points to the side cusps of the central teeth, not 

 figured by him. 



Oaraed 



