Clark. — Ophiuroidfa. 



PLATE 2. 



Figs. 1, 2. — Ophiomastix bispinosa H. L. Clark. X 4. 



1. Upper surface. 



2. Lower surface. 



Fig. 3. — Ophiacantha quadrispina H. L. Clark. X 2. 



3. Upper surface of best-preserv^ed disk. 



