PLATE II. 



FIG. 



1. CLAVA LEPTOSTYLA, p. 6, a group, of the natural size. 



1 . The same, magnified. After Agassiz, ' Contributions 



to the Nat. Hist, of the U. S/ vol. iv. pi. xxi. 



2. TUBICLAVA CORNUCOPIA, p. 11, nat. size. 



2 a. The same, magnified. After Alder. 



