PLATE 35. 



Phacodiscida. 



Diam. Page 

 Fig. 1. Heliodiscus pertusus, n. sp. (vel Heliosestrum pertusum), . x 400 448 



Irregular form with ten (instead of eight) larger latticed spines. 



Fig. 2. Heliodiscus glyphodon, n. sp. (vel Heliosestrum glyphodon), . x 300 446 



Fig. 3. Heliodrymus ramosus, n. sp., . . . ... . x 300 452 



Fig. 4. Heliodrymus ramosus, n. sp., . . . . . x 500 452 



Medullary shell and a segment of the disk. 



Fig. 5. Heliodrymus viminalis, n. sp., . . . . . x 400 452 



Marginal view. 



Fig. 6. Phacodiscus clypeus, n. sp., . . . . . x 400 425 



Fig. 7. Phacodiscus rotula, n. sp., . . . . . x 400 424 



Marginal view. 



Fig. 8. Phacodiscus lentiformis, n. sp., . . . . x 400 425 



Vertical section nearly through the centre. 



Fig. 9. Phacodiscus clypeus, n. sp., . . . . . x 400 425 



Vertical section nearly through the centre. 



