PLATE XXXI. 



FIG. I. Pycnopodia helianthoides (Brandt). Young, in alcohol. Dorsal side; 

 X about 5. 



FIG. 2. The same specimen. Actinal side. These figures show the inter- 

 budding of new rays, symmetrically to a median plane indicated 

 by the arrows; a, a, last- formed rays; b, b', previous or first pair 

 of interpolated rays, one on either side of a primary odd ray. 



(6 4 ) 



