124 University of California Publications in Zoology. [Vol. 4 



Fig. 10. — Outline of the dorsal surface of the starfish, showing the desig- 

 nation of the rays, as employed in the text. The dark spot is the madreporic 

 plate. 



Fig. 11. — Designation of the rays as seen from the ventral surface. The 

 position of the madreporic plate on the dorsal surface is seen in outline. 



