Platk 123. 

 1. Clypeaster rosaceus (L.)- 



1. Triilfntatc pudicfllaria. X 30. 



2^. Clypeaster pallidus IT. L. (lark. 



2. Side view of xahc of trideiitatc podiccllaria. X 30. 



3. Mlaili' of valve of trideiitatc pedirellaria. X 70. 



4. Hlade of valve of ophicephalou.s pedieellaria. X 70. 



5-10. Clypeaster ravenelii (\. Ag.). 



i'). Side view of small vaK'e of ophiceplialous pedieellaria. X 70. 



fl. .Side view of large valve of opliieei)halous ]jedieellaria. X 70. 



7. Interior view of valve of (luadridentate pedieellaria. X 70. 



5. Interior view of loop of valve of ophicephalous pedieellaria. X 70. 

 0. Interior view of loop of valve of ophicephalous pedieellaria. X 70. 



10. (^nadridentate pedieellaria. X 70. 



11, 12. Clypeaster subdepressus (Gray). 



11. (^uadridentate pedieellaria. X 30. 



12. Interior view of valve of quadridentate pedieellaria. X 30. 



13-16. Clypeaster europacificus H. L. Clark. 



13. Small \alve of ophicephalous petlicellaria. X 70. 



14. Large valve of ophicephalous pedieellaria. X 70. 



15. Side view of valve of tridentate pedieellaria. X 70. 

 1(). Valve of tridentate pedieellaria. X 70. 



17-20. Clypeaster leptostracon \. Ag. & CI. 



17. Ophicephalous pedieellaria with \alves open. X 70. 



IS. Triphvllous pedieellaria. X 70. 



10. ^'alve of tridentate pedieellaria. X 70. 



20. Small tridentate pedieellaria. X 70. 



21, 22. Clypeaster lamprus II. L. Clark. 



21. Small tridentate pedieellaria. X 70. 



22. Valve of large tridentate pedieellaria. X 70. 



23. Clypeaster humilis (Leske). 



23. Interior view of loop of large valve of ophicephalous pedieellaria. X 70. 



24. Clypeaster audouini Fourtau. 



24. Valve of triphyllous pedieellaria. X 300. 



