MEDUSAE FROM THE MALDIVE ISLANDS. Bigelow Index Plate [1],2,3,4,5,6,7,8 EXPLANATION OF PLATES. OC., otocyst; m. s.,., marginal sense organ. Fig. 1. Euphysa tetrabrachia. Fig. 2. Oceania brunescens Fig. 3. Oceania virens. Fig. 4. Oceania virens. bell margin. Click on the plate for a larger version.