PLATE XL VI. 



Figure 1. Ccelopleurus Forbesi, d'Archiac (page 287) . 



2. Aaother specimen. 



3. CosLOPLEURUS SiNDENSis, Duncan and Sladen (page 298). 



4. Ccelopleurus Forbesi. A small specimen (page 295). 



5. Ccelopleurus Sindensis. A more tumid form. 



6. The apical disk of a small specimen, magnified. 



7. Ccelopleurus Forbesi. An ambulacrum, abactinal part, magnified, showing the sutures 



fairly well. 



8. Ccelopleurus Sindensis. Part of an interradium near the apical system, magnified. 



9. Ccelopleurus Forbesi. The peristomial part of an ambulacrum, showing the "Tags," 



magnified. (The artist has placed, by mistake, two pores actinally to one of the 

 ambulacral tubercles.) 

 10. Ccelopleurus Sindensis. Part of an ambulacrum, magnified. 



