PLATE 41. 



PORODISCIDA et SPONGODISCIDA. 



Diam. Page 



Fig. 1. Porodiscus flustrella, n. sp., . . . . x 300 493 



Fig. 2. Porodiscus perispira, n. sp., . . . . x 200 . 495 



The rings alone (equatorial section). 



Fig. 3. Porodiscus quadrigatus, n. sp., . . . . x 200 494 



The rings alone (equatorial section). 



Fig. 4. Porodiscus semispiralis, n. sp., . . . . x 500 497 



Fig. 5. Perichlamydium saturnus, D. sp., . . . . x 300 499 



Fig. 6. Porodiscus centrospira, 11. sp. (velPerispongidiumcentrospira), x 200 495 

 The rings alone (equatorial section). 



Fig. 7. Porodiscus irregularis, n. sp. (vel Perispongidium irregulare), x 200 498 

 The rings alone (equatorial section). 



Fig. 8. Stylodictya heliospira, n. sp., . . . . . x 400 512 



Fig. 9. Stylodictya centrospira, n. sp., . . . . x 400 512 



Fig. 10. Stylochlamydium asteriscus, n. sp., . . . x 400 514 



Fig. 11. Stylotrochus yeddesii, n. sp., . . . . x 300 585 



