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 disc 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 



Fig. 58. Form freqnentl}- assumed by Soar-fi^h under similar ciramistances. 



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 

 craAvl 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. 



