220 



THE OCEAN WORLD. 



Such also is R. Aldrovandi (Fig. 90), which appears all the year 

 round in calm weather. It is an animal much dreaded by bathers. 

 It possesses an urticaceous apparatus, which produces an effect similar 

 to the stinging-nettle when applied to the skin. If the animal touches 

 the fisherman at the moment of being drawn from the water, it is apt 

 to inflame the part and raise it into pustules. 



Fig. 89. Rhizostoma Cuvieri. 



Cassiopea and Cephea are two other types belonging to the same 

 group. In Cassiopea Andromeda (Fig. 91), belonging to the first, the 

 disk is hemispherical, but much depressed, without marginal tentacles 

 or peduncle, but with a central disk, with four to eight half-moon- 

 shaped orifices at the side, and throwing off eight to ten branching 

 arms, fringed with retractile sucking disks. Cephea Cyclophora, 



