PLATE 17. 



STYLOSPH.ERIDA, DRUPPULIDA et SPONGURIDA. 



Diam. Page 



Fig. 1. Stylatractus giganteus, u. sp. (vel Amphistylus giganteus), x 300 329 



Fig. 2. Stylatractus sethoporus, n. sp. . . . x 400 330 



The greater part of the cortical shell taken off. 



Fig. 3. Stylatractus sethoporus, n. sp., . . . x 400 330 



The entire cortical shell. 



Fig. 4. Stylatractus compactus, n. sp., . . . x 400 329 



Fig. 5. Amphisphcera cronos, n. sp. (vel Amphistylus cronos), . x 400 144 



Fig. 6. Stylatractus neptunus, n. sp. (vel Amphisphcera neptunus), x 300 328 



Fig. 7. Amphisphcera pluto, n. sp., . .; . '. . , x 300 144 



The entire cortical shell. 



Fig. 8. Amphisphcera pluto, n. sp., . . . . x 300 144 



Meridional section through the three concentric shells. 



Fig. 9. Xiphatractus glyptodon, n. sp., . . . x 400 334 



The entire cortical shell. 



Fig. 10. Xiphatractus glyptodon, n. sp., . . x 400 334 



The greater part of the cortical shell taken off. 



Fig. 11. Xiphatractus armadillo, n. sp. . . x 400 332 



Fig. 12. Spongoxiphus prunococcus, n. sp., . . . x 300 354 



The spongy cortical shell 



Fig. 13. Spongoxiphus prunococcus, 11. sp., . . x 600 354 



The two concentric latticed medullary shells. 



