Ci-ARK. — Ophiuroidea. 



PLATE 6. 



Figs. 1, 2. — Ophiura stenobrachia H. L. Clark. X 4. 



1. Upper surface. 



2. Lower surface of another specimen. 



Figs. 3, 4. — Ophiomusium tripassalotum H. L. Clark. X 5. 



3. Upper surface. 



4. Lower surface. 



Figs. 5-8. — Ophiomusimn canalicvilatum H. L. Clark. X 4. 



5. Upper surface. 



6. Lower surface. 



7. Partly ventral view of basal portion of arm, to show the longitudinal 



furrow. 



8. Side view of basal portion of arm. 



