JACKSON 



PLATE 1 





B r 



1. Cidaris anguillae. 8 to 10. C.loveni. 

 2 to 5. C. peloria. 11. C. clevei. 



6,7. C. f(.)veata. 12 to 17. C. melitensis. 



18 to 20. C. tribuloides. 



21 to 24. Echinometra prisca. 



