;icie 

 Pyloric cecum 



Coelom 

 Ampulla 



Perihemal cana 

 Radial nerve 

 Ambulacral groove 



Oral surface of ray 

 shov/ing tube feet 



Epidermis 



Peritoneum 

 Dermal bronchia 



w^a Ambulacral ossicle 

 nMiPrrrr . — Radiol canal 



ood vessel 



Figure 193. General structure of the starfish. The disk and aboral surface are removed from 

 two rays. Below, one ray is shown in cross section, without gonads. 



307 



