Plate 52. 

 1-7. Salenocidaris erassispina A. Ag. and CL 



1. Actinal view of denuded test. X 10. 



2. Abactinal view of same. X 10. 



3. Left anterior ambulacrum. X 10. 



4. Eight posterior interambulacrum. X 10. 



5. Primary spine. X 4. 



6. Base of primary spine. "K 8. 



7. Tip of primary spine. X 8. 



8-13. salenia cincta A. Ag. and CI. 



8. Actinal view of denuded test, x 4. 



9. Abactinal view of same. X 4. 



10. Odd anterior ambulacrum. X 4. 



11. Left posterior interambulacrum. X 4. 



12. Base of primary spine. X 4. 



13. Tip of primary spine. X 4. 



