

Diam. 



Page 



X 



400 



448 



X 



300 



446 



X 



300 



452 



X 



500 



452 



PLATE 35. 



Phacodiscida. 



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

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



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



Fig. 3. Heliodrymus ramosus, n. sp., . 



Fig. 4. Heliodrymus ramosus, n. sp., . 



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. 



