Plate 156. 

 1-3. Spatangus californicus H. L. Clark. 



1. Abactinal view of specimen from off southern California (St. 2072,'. 



2. Actinal view of holotype (St. 2973). 



3. Abactinal view of holotype. 



4. Brisaster moseleyi (A. Ag.). 



4. Abactinal view of a large, bare test from near Valdivia, Chile. 



5-7. Moira clotho (Mich.). 



5. Abactinal view of specimen from Panama. 



6. Actinal view of same. 



7. Left-side view of same. 



All figures, natural size. 



