MEDUSfD^E. 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. Cyanea aurita is figured on page 160. 



Fig. 56. Rhizostbma Aldrovandi. 



In the genus Rhizostoma 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 Pe'ron 

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

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



