ECHINODERMATA 
to 
Fic. 133.—The common Starfish (A sterias rubens), dissected to show motor, digestive, 
and reproductive systems. After Rolleston and Jackson. 
1. Central radius of trivium. 9. Ampullae of tube-feet. 
2. Right arm of trivium. 10. Ambulacral plates, inner surface. 
3. Left arm of trivium. 11. Pyloric portion of stomach. 
4. Left arm of bivium. 12. Duct leading from stomach to paired 
5. Right arm of bivium. caeca, 
6. Madreporic plate and canal. 13. Cardiac division of stomach bulging 
7. Arborescent ‘hepatic’? caeca, two in into arm. 
each arm. 14. Anus. 
8. Generative glands. 
