EXPLANATION OF PLATES.
OC., otocyst; m. s.,., marginal sense organ.
Fig. 24. Porpita lutkeana.
Fig. 25. " " vertical section of disk; s, central stigmata; car, c. central chamber; c., circular partition; R., white tubules; H. , brown hepatic tubules.
Fig. 26. Porpita lutkeana, reproductive polypite with budding Medusae.
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