( 



Clark. — Ophiuroidea. 



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-preserved disk. 



