PLATE 17. 



Stylosph^erida, Druppulida et Spongurida. 



Fig. 1. Stylatractus giganteus, n. sp. (vel Amphistylus giganteus), 



Fig. 2. Stylatractus sethoporus, n. sp. .... 

 The greater part of the cortical shell taken off. 



Fig. 3. Stylatractus sethoporus, n. sp., 

 The entire cortical shell. 



Stylatractus compactus, n. sp., 



Amphisphcera cronos, n. sp. (vel Amphistylus crofios), 



Stylatractus neptunus, n. sp. (vel Amphisphcera neptunus), 



Amphisphcera pluto , n. sp., 

 The entire cortical shell. 



Amphisphcera pluto, n. sp., . 



Meridional section through the three concentric shells. 



Fig. 9. Xiphatractus glyptodon, n. sp., 

 The entire cortical shell. 



Fig. 10. Xiphatractus glyptodon, n. sp., 



The greater part of the cortical shell taken off. 



Fig. 11. Xiphatractus armadillo, n. sp. 



Fig. 12. Spongoxiphus prunococcus, n. sp., . 

 The spongy cortical shell. 



Fig. 13. Spongoxiphus prunococcus, n. sp., 



The two concentric latticed medullary shells. 



Fig. 



4. 



Fig. 



5. 



Fig. 



6. 



Fig. 



7. 



Fig. 



8. 



Diam. 

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