PLATE 26. 



LlOSPH^RIDA et ASTROSPH^RIDA. 



Fig. l. 



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Coscinomma amphisiphon, n. sp., 

 Fig. la. A piece of the lattice-shell, 

 - Fig. 16. Vertical section through the shell- wall, 



Heliosphcera hexagonaria, n. sp., 



Acanthosphcera castanea, n. sp., 



Acanthosphcera angulata, n. sp., 



Acanthosphcera reticulata, n. sp., 



Heliosphcera coronata, n. sp., 

 Fig. 6a. A single pore with its coronal, 



Acanthosphcera mucronata, n. sp., 



Acanthosphcera clavata, n. sp., . 



Heliosphcera pectinata, n. sp., 



Cenosphcera perforata, n. sp., . 



Cenosphcera coronata, n. sp., . 







Diam. 



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