xiv] 



ASTERIAS 



329 



parts of the body-wall or perhaps carrying away waste matter. 

 A third section again secrete the fibres which bind the various rods 

 constituting the skeleton together and thus form a simple and 

 primitive variety of connective tissue. 



Fm. 151. The common Star-fish, Asterias rubens, dissected to show motor, 

 digestive and reproductive systems. After Bolleston and Jackson. 



15. The five arms. 6. Madreporic plate and canal. 7. Arborescent 



"hepatic" caeca, two in each arm. 8. Generative organs. 9 Am- 



pullae of tube-feet. 10. Ambulacral plates, inner surface. 11. Pylorio 

 sac. 12. Duct leading from pyloric sac to pyloric caeca. 13. Stomach 

 bulging into arm. 14. Anus. 



