PLATE XCVII. 

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



from Alaska; about Yn natural size. Yale Mus. 

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



Dorsal side, showing abundant pedicellariae; X ij4- Yale 



Mus. 

 Figs. 2a, 2b. The same specimen. Portions of disk ; X 5- 2a, shows many 



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



shows also the madreporite. 



(196) 



