PLATE XCVII. 



FIG. I. Pteraster tesselatus Ives. Actinal side of an alcoholic specimen 



from Alaska ; about ^ natural size. Yale Mus. 

 FIG. 2. Dermasterias imbricata (Grube), var. valvifera Verrill. Type. 



Dorsal side, showing abundant pedicellariae; X i/4- Yale 



Mus. 

 FIGS. 20, 2&. The same specimen. Portions of disk ; X 5- 20, shows many 



three-valved pedicellariae and some four-valved; fig. 2&, 



shows also the madreporite. 



(196) 



