784 
ROBERT PAYNE BIGELOW 
EXPLANAIION OF FIGUEES 
33 Radial section through the rhopalium of a young Chrysaora just passing 
into the adult form. The specimen was about 10 mm. broad and the second set 
of tentacles about as long as the marginal lobes. X 300. 
34 A section at right angles to the above through another rhopalium of the same 
animal. X 280. 
35 A radial section through the rhopalium of an ephyra of Dactylometra. 
there has evidently been considerable shrinkage of the mesogloea in this 
specimen. X 523. 
36 A similar section from a somewhat older larva. X 490. 
37 A tangential section through the sensory niche just proximal to the base of 
the rhopalium in a \^oung Dactylometra about 18 mm. in diameter, which is in 
the early part of the Chrj^saora stage. X 190. (Compare figs. 7 and 18). 
38 A section parallel to the above about 60 ^ farther inward through the outer 
half of the lateral pockets. X 190. 
