438 



GENERAL ZOOLOGY 



pedicellariae, and tubercles project on the surface. At the tip 

 of each arm is an eyespot. Starfish possess a remarkable 

 power of regenerating lost parts. 



Fig. 258. — Asterias, a starfish, viewed from the aboral side. The pale circular 

 area to the left of the center is the madreporite. The ambulacral grooves through 

 which the ambulacra extend can be seen on two of the upturned arms. 



Fig. 259. — A, Ophiura, a brittle star, aboral view; B, oral view of central disk; 

 C, oral side of portion of arm, magnified, showing ambulacra, am. 



Example: Asterias forbesi, a common starfish, Cape Cod 

 region (Fig. 258). 



