Platk 15. 



Stereocidaris leueaeantha A. Ag. and Clark. 



1. Abactiiial view of medium-sized specimen. 



2. Artinal view of same. 



3. Ainbulaeral view of partly cleaned specimen. 



4. Interambulacral view of same. 



Other views of specimen shown in figs. 3 and 4 will be found on Plate 32, figs. 5 and C. 



All fitrures natural size. 



