lém^de la Société d.sc.natde Cherbourg. Vol XX 



PI 3 



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'ith Fissoh Strasbi 



1-S BATRACHOSPERMUM. 3 NEMALION. 4-6 HELMINTHORA. 7-14 S PERMOTHAMNION . 

 lS-18 CALLITHAMNION. 19-20 CERAMIUM. 



