Plate 122. 

 1-4. Clypeaster lamprus H. L. Clark. 



1. Large actinal primary spine; side view. X 6. 



2. Actinal primary spine; side view. X 0. 



3. Actinal primary spine; top view. X 2. 



4. Tip of small primary spine; side view. X 60. 



5-7. Clypeaster rotundus (A. Ag.). 



5. Tip of primary spine; side view. X 70. 



6. Tip of primary spine; top view. X 70. 



7. Tip of miliary spine; side view. X 130. 



8, 9. Clypeaster leptostracon A. Ag. & CI. 



8. Tip of miliary spine. X 150. 



9. Tip of primary spine. X 70. 



10. Clypeaster audouini Fourtau. 



10. Tip of miliary spine. X 100. 



11. Clypeaster speciosus Verrill. 



11. Tip of primary spine. X 70. 



12-14. Clypeaster ravenelii (A. Ag.). 



12. Actinal ambulacra] primary spine, from near mouth; side view. X 30. 



13. Actinal ambulacra] primary spine, from near mouth; top view. X 30. 



14. Actinal interambulacral primary spine; side view. X 30. 



15. Clypeaster virescens Dod. 



15. Terminal third of marginal primary spine; side view. X 70. 



16-18. Clypeaster pallidus II L Clark. 



Hi. Tip of actinal primary spine; side view. X 70. 

 17. Tip of ahactinal primary spine; side view. X 70. 

 IS. Tip of ahactinal primary spine; top view. X 70. 



