PLATE XXIX. 



FIG. i. Pycnopodia helianthoides (Brandt) Stimpson. Actinal side; about 



y$ natural size. Yale Mus. 

 FIG. 2. Dermasterias imbricata (Grube) Perrier. Dorsal side; % natural 



size. Yale Mus. 



(60) 



