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1.2. Planorbis luaxpiaatas . 3. do. ra.r. rlid.mJbea 

 4.5. P. carmatns. 7. 8. P. Toctov 

 9. 10. P spin-rLis. n. 12. P ruU.hs . 



Zcmdon.Iitbltshed.by John Van Voorst 78S2. 



