GEOL.MAG.18 82 



DECADE II.V0L.1X.pl ATE DC.. 



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Sv- , 



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K , C - Wooaj^ar-cL- cZ^L.et IMv 



West^ T^e-wy^Lca^ & Co X*VV3 ■ 



Fig s. 1 -1 S.TSfew- Pliyllop od Ci'ustaeean slnields.irora the Upper Devonian, 

 Eifel: &Fig.l7 from tlie U.Silurian, S .Wales. 



