PLATE 81. 



Cenodiscida et Phacodiscida. 



Fig. 1. Sethostaurus orthostaurus, n. sp., 



Sethostaurus orthostaurus, n. sp., 

 Vertical section through the centrum. 



Sethostaurus recurvatus, n. sp., 



Optical section through the equatorial plane. 



Sethostaurus rhombostaurus, n. sp., 

 Optical section through the equatorial plane. 



Sethostaurus cruciatus, n. sp. (vel Heliostaurus cruciatus), 



Phacostaurus oceanidum, n. sp., 



Phacostaurus magnificus, n. sp., 



Phacostaurus magnificus, n. sp., 



Vertical section through the centrum. 



Sethostylus dictyliscus, n. sp., . 



Sethostylus dicylindrus, n. sp., 

 Marginal view. 



Stylodiscus endostylus, n. sp. (vel Sethostylus endostylus), 

 Phacostylus amphistylus, n. sp., 



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