MEDUSIDM. 



165 



like tentacles, of a bright red. The peduncle is broad and flat, 

 perforated in the middle, to which are attached four broad foliaceous 

 arms. Cyatiea aurita is figured on page 160. 



Fig. 56. — Rhizostoma AldrovandL 



In the genus Rhizostotna the disc is hemispherically festooned, 

 depressed, without marginal tentacles, peduncle divided into four 

 pairs of arms, forked, and divided almost indefinitely each having at 

 their base two toothed auricles. Such is Rhizostoma Cuvierii of Peron 

 (Fig. 55), the disc of which is of a bluish-white, like the arms, and of 

 a rich violet over its circumference. This beautiful form is found 



