PLATE 107, 



OROSPHiBEIDA. 



(Fig. 8 of this Plate has no number, by mistake ; it is at the top in the middle.) 



Diam. 

 Fig. 1. Oroplegma diplosphcera, n, sp,, . . . x 50 



The entire shell, enveloped by an outer mantle of spongy framework. 



Fig. 2. Oroplegma giganteum, n. sp., „ . . . x 200 1601 



A small piece of the spongy framework. 



Fig, 3» Oroplegma spongiosum, n. sp., . . . x 50 1601 



A pyramidal elevation of the inner shell, with its spongy framework^ and 

 a radial spine on the top. 



Fig. 4. Oroscena bwrii, n. sp., 9 . . . x 100 1598 



A pyramidal elevation of the shell, with a radial spine on its top. 



Fig. 5. Or ona maxima, n. sp., . . . . x 300 1594 



A small piece of the network ; the central canals of the bars are partly 

 filled by air. 



Fig. 6. Oroscena cuvieri, n. sp., . . . . x 50 1598 



A single radial spine. 



Fig. 7. Orona crassissima, n. sp., . „ . . x 300 1594 



A single bar of the coarse network, with dimpled surface. 



Fig. 8. Oroscena mulleri, n. sp., . . . . x 50 1 



A single radial spine. 



