PLATE XLI. 



Figure 1. Echinolampas discoidbuSj d'Archiac (page 261). 



2. Side view. 



3. Variety a. Large specimen (page 262), truncated in front, actinal surface. 



4. The peristonle of another specimen, natural size. 



5. The floscelle and peristome^ semi-diagram, magnified slightly. 



