780 
ROBERT PAYNE BIGELOW 
EXPLANATION OF FIGURES 
17-20 A series of sections from Dactylometra quinquecirrha. X 56. Fig. 17 
corresponds to fig. 5 of Chrysaora, fig. 18 is in a plane corresponding to V of fig. 10, 
fig. 19 corresponds to fig. 7, and fig. 20, which is oblique to the radius, nearly corre- 
sponds to fig. 8. 
21 The ends of one of the arms of an ephyra of Chrysaora viewed from the under 
side as a transparent object, showing the relations between the rhopalium, the 
gastric pouch (r.c), and marginal lappets. X 280. 
22 Longitudinal section of a rhopalium from the same specimen. X 600. 
