PLANCHE I. 



Figures. 



1, 1«, 1'^. HeJix sumalrana, von Martens. 



2, 2«. Amphidromiis sumatranus, von Martens. 



3, 3*, 3''. Stoiogyra octona, Chemnitz. 



4. Cyclophorus tuba, Sowerby, var. minor. 



5, 5<». Pterocychis planorbulus, Lamarck. 



6, 6», 6*. Pytliia imper forata, A. Adams. 



7, 7«. Neritina ziczac, Lamarck. 

 8, 8", 8*. — turrita, Chemnitz. 



9^ Qa. — — var. semiconica, Lamarck. 



10, lO'». — diadema, Recluz. 



11, 11«, 11^. — co7mca, L'mné. 



12. — pulligera, Linné, var. sumatrana. 



13, ].3«. — auriculata, Lamarck. 



14, 14». Septaria iessdlata, Lamarck. 



15. — — var. lineata, Lamarck. 



16. — — var. clypeolum, Recluz. 



