298 JELLY-FISH, STAR-FISH, AND SEA-URCHINS. 
before mentioned as occurring under this form of 
section in detached rays, has the effect, when now 
occurring in all the rays, of elevating the dise from 
the floor of the tank. This opisthotonous-like 
spasm is not, however, permanent; and the distal 
ends of the rays forming adhesions to the floor of 
the tank, the animal eventually rights itself, though 
2 
y>Fasrz 27777 
» 
Fig. 58. Form frequently assumed by Star-fish under similar circumstances. 
much more slowly than unmutilated specimens. 
After it has righted itself, although it twists about 
the distal portions of the rays, it does not begin to 
crawl for a long time, and when it does so, it crawls 
in a slow and indeterminate manner. Star-fish 
so mutilated, however, can ascend perpendicular 
surfaces. 
