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. 17. Liriope indica. Fig. 18. " " bell margin. Fig. 19. Pegantha simplex. Fig. 20. " " oral view. Click on the plate for a larger version.