Hig: 1. 
Fig. 2. 
AGASSIZ AND MAYER: MEDUSA FROM AUSTRALIA. 19 
EXPLANATION OF THE PLATES. 
PLATE I. 
Desmonema rosea; oral view ; + natural size. 
PLATE II. 
Side view of Crambessa mosaica ; 2 natural size. 
PLATE III. 
Crambessa mosaica. 
Aboral view of marginal sense organ. 
. Side view of the terminal portion of one of the mouth-arms, highly magni- 
fied, showing the suctorial mouths and the furrows bordered by rows of 
tentacles. 
Side view of a mouth-arm. 
. Cross section of one of the mouth-arms. 
