Plate 42. 



Acanthoeidaris hastigera A. Ag. and Clark. 



1. Abactinal view of partly cleaned, small specimen. 



2. Aotinal view of same. 



3. Intevambiilacral view of same. 



4. Ambulacral view of same. 



5. Abactinal view of small specimen. 



6. Actinal view of same. 



7. Abactinal view of partly cleaned, very small specimen. 



8. Actinal view of same. 



9. Interambnlacral view of same. 



10. Ambulacral view of same. 



All figures natural size. 



