PLATE XXIV. 



FIG. i. Orthasterias columbiana Verrill. Type. In alcohol. Actinal side of a 



ray; X iH- 

 FIG. 2. The same specimen. Dorsal side of a ray; X i^- Yale Mus. Same 



specimen as pi. xix. 

 FIG. 3. Evasterias acanthostoma Verrill. Type. Part of a ray (dry), side 



view ; about natural size. Univ. Calif. 

 FIG. 4. Orthasterias columbiana Verrill. Details of actinal side ; X i%- 



Yakutat, Alaska. Yale Mus. 



(50) 



