PLATE VI IK 



Amblypneustes formosus, /. 1, 2. 



1. Ovoid specimen in profile. 



2. Spherical specimen in profile. 



Amblypneustes ovum, /. 3, ^ 



3. Seen in profile. 



4. Seen from the abactinal pole. 



Holopneustes purpurescens, /. 5, 6. 



5. Seen in profile. 



6. Seen from the abactinal pole. 



Amblypneustes pentagonus, /. 7, 8. 



7. From above. 



8. In profile. 



Holopneustes porosissimus, /. 9, 10. 



9. Seen in profile. 



10. Seen from the abactinal pole. 



Microcyphus zigzag, /. 11 - 13. 



11. Seen in profile. 



12. Seen from the abactinal pole. 



13. Yovmg specimen seen in profile. 



Mespilia globulus, /. IJ^. 



14. Seen from the actinal side. 



{All Figs, natural size.) 



