TAB. I. 



Fig. 



1. Helix vy%?L,j}ar/e 4. 



a. upper surface. 



b. under surface. 



c. front view. 



2. Helix arbustorum (?), /». 3. 



a. upper surface. 

 h. under surface. 

 c. front view. 



3. Helix hispida, jf;. 2. 



a. under surface. 



b. upper surface. 



c. front view. 



4. Helix pulchella,jy. 3. 



a. upper surface. 



b. under surface. 



c. front view. 



5. Succinea putris (?), p. 5. 



6. Succinea oblonga, jo. 6. 



7. Limnsea peregra, 7J. 7. 



a. fi'ont view. 



b. back view. 



8. Lininaea truncatula {r),p. 8. 



a. var. «. 

 /;. var. /3. 



Fig. 

 9. Limnsea palustris (?), j». 7. 



a. front view, var. a. 



b. id. var. /3. 



c. back view. 



d. front view of another specimen. 



10. Planorbis complanatus,j?j. 9. 



a. under surface. 



b. upper surface. 



c. front view. 



1 1 . Planorbis spirorbis, p. 9. 



a. upper surface. 



b. under surface. 



c. front view. 



12. Planorbis corneus, /). 10. 



a. under surface. 



b. upper surface. 



c. front view. 



13. Conovulus pyramidalis, j». 11. 



a. front view. 



b. back ^^ew. 



14. Conovulus myosotis (?), j'A 12. 



a. front view. 



b. back -view. 



1 5. Conovulus myosotis (?), var. /3. 



The lines indicate the size of the specimens. 



