Plate 1. 



1-2. Cidaris Thouarsii Val. 



1. Upper end of stalk of globiferous pedicellaria, showing entire absence of limb. x 15G 



2. Valve of small globiferous pedicellaria. x 156. 



3-7. Cidaris metularia BI. 



3. Upper end of stalk of globiferous pedicellaria, showing presence of limb, x 156. 



4. Valve of small globiferous pedicellaria. x 156. 



5. Tip of valve of another small globiferous pedicellaria. x 156. 



6. Valve of globiferous pedicellaria. x 156. 



7. Valve of tridentate pedicellaria. x 15G. 



