PLATE 33. 

 PHACODISCIDA. 



Plain. Page 



Fig. 1. Sethodiscus lenticula, n. sp., . . . . . x 300 423 



Fig. 2. Sethodiscus lenticula, n. sp., . . . . x 300 423 

 Vertical section. 



Fig. 3. Sethodiscus macrococcus, u. sp., . . . x 300 423 



Young shell, not yet closed, seen from the margin. 



Fig. 4. Periphcena cincta, n. sp., . . . . . x 400 426 



Fig. 5. Triactiscus tricuspis, n. sp., .. . . . . x 300 432 



Marginal view. 



Fig. 6. Triactiscus tripyramis, n. sp., . . . . . x 400 432 



Fig. 7. Heliodiscus cingillum, n. sp., . . . . . x 300 448 



Fig. 8. Heliodiscus asterisciis, n. sp., . . . . . x 300 445 



Fig. 9. Heliodrymus dendrocyclus, n. .sp. (vel Heliocladus dendrocyclus), x 300 451 



