PLATE 31. 



Cenodiscida et Phacodiscida. 



Diam. Page 



Fig. 1. Sethostaurus orthostaurus, n. sp., . . . x 300 433 



Fig. 2. Sethostaurus orthostaurus, n. sp., . . x 300 433 

 Vertical section through the centrum. 



Fig. 3. Sethostaurus recurvatus, n. sp., . . . . x 100 434 



Optical section through the equatorial plane. 



Fig. 4. Sethostaurus rhombostaurus, n. sp., . . . x 100 434 



Optical section through the equatorial plane. 



Fig. 5. Sethostaurus cruciatus, n. sp. (vel Heliostaurus cruciatus), . x 300 434 



Fig. 6. Phacostaurus oceanidum, n. sp., . . . x 300 435 



Fig. 7. Phacostaurus magnificus, n. sp., . . . . x 400 436 



Fig. 8. Phacostaurus magnificus, n. sp., . . . . x 200 436 



Vertical section through the centrum. 



Fig. 9. Sethostylus dictyliscus, n. sp., . . . . . x 400 428 



Fig. 10. Sethostylus dicylindrus, n. sp., . . . . x 300 428 



Marginal view. 



Fig. 11. Stylodiscus endostylus, n. sp. (vel Sethostylus endostylus), . x 300 413 



Fig. 12. Phacostylus amphistylus, n. sp., . . . . x 300 430 



