Ann.des Sciences nat.7^Série. 

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Imp. Edouard Bry, Pans. 



1-'^. Planorbis adov/ensis, 5-8. PL Lavigerianus, 9-12. PI. 

 Bridouxianus. 13-15. PI. sudanicus, 16-17. PI, tanaanikanus. 

 18-19. Limnasa Lavigenana; 20. L.Debaizei, 21-22. L.Laurenti. 

 23. L.Jo-aberti, 24'-25. Phvsa Coulboisi, 26-27. Ph.Randabeli. 



