PLATE XXIV. 



Figure 1. CoNoCLYPErs rostratus, Duncan and Sladen (page 128). Abactinal view of the testj 

 natural size. ' 



2. Longitudinal profile of the teat, natural size. 



3. A portion of the left posterior ambulacral petal, at its widest part, magnified. 



4. Terminal extremity of the same petal, magnified. 



5. CoNocLYPEUs GALERrs, Duncan and Sladen (page 129). Abactinal view of a fragmentary 



test, natural size. 



6. Longitudinal profile of the same specimen, natural size. 



7. Longitudinal profile of another test, natural size. 



8. A portion of an ambulacral petal, at its widest part, magnified. (Same test as figs. 5 & 6.) 



9. Terminal extremity of the same petal, magnified. 



10. Diagram showing the arrangement of the ambulacral plates on the actinal surface, near 

 the peristome, magnified. 



