PLATE XII. 
Figs. 1-14. Mrracrinvs ANGULATUS, 0. sp. 
Figs. 1, 2. Upper and lower views of the basal ring, 
Figs. 3, 4. Proximal and distal faces of the fourth (axillary) radial, 
Figs. 5, 6. Proximal and distal faces of the third radial, 
Figs. 7, 8. Proximal and distal faces of the epizygal of the second 
radial, 
Figs. 9, 10. Proximal and distal faces of the hypozygal of the second 
radial, 
Fig. 11. Lower or dorsal aspect of a first radial, 
Fig. 12. Distal articular face of a first radial, 
Figs. 13, 14. An isolated basal, from below and above, 
Figs. 15-25. Prnracrrnus astertus, Linn., sp. 
Figs 15, 16. Upper and lower views of the calyx, 
Fig. 17. Dorsal aspect of the two outer radials with the first distichals 
attached, 
Figs. 18, 19. Proximal and distal faces of the third (axillary) radials, 
Figs. 20, 21. Proximal and distal faces of the second radials, 
Fig. 22. Lower or dorsal aspect of a first radial, 
Fig. 23. Distal articular face of a first radial, 
Figs. 24, 25. An isolated basal, from below and above, 
Diam. 
