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PLATE XV^ 
Clypeaster subdepressus Agass. 
Seen from above, natural size ; half tbe test denuded. 
The same, seen from the actinal side. 
Part of one of the median ambulacral zones of the actinal side, somewhat magnified. 
Part of one of the median iuterambulacral zones of the abactinal side, magnified. 
