Plate 42. 

 Acanthocidaris hastigera A. Ag. and Clark. 



1. Abaetinal view of partly cleaned, small specimen. 



2. Actiiial view of same. 



.".. Intevainbulacral view of same. 

 4. Ainbiilaoral view of same. 

 ,5. Abaetinal view of small specimen. 

 r>. Actinal view of same. 



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



8. Actinal view of same. 



9. Interambulacral view of same. 



10. Ambulacral view of same. 



All figures natural size. 



