PLATE 17. 



Stylosph^rida, 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. 



Fig. 4. Stylatractus compactus, n. sp., 



Fig. 5. Amphisphcera cronos, n. sp. (vel Amphistylus cronos), 



Fig. 6. Stylatractus neptunus, n. sp. (vel Amphisphara neptunus), 



Fig. 7. Amjihisphcera pluto, n. sp., 

 The entire cortical shell. 



Fig. 8. Amphisphmra 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. 



Diam. 

 X 300 



X 400 



x 400 



x 300 



x 400 



x 400 



x 400 



x 300 



x 600 



Page 



329 

 330 



330 



X 



400 



329 



X 



400 



144 



x 



300 



328 



x 



300 



144 



144 

 334 

 334 



332 



354 



354 



