PLATE 16. 



Stylospilerida et Druppulida. 



Fig. 1. Stylosphcera melpomene, n. sp., 



Fig. 2. Lithatractus jugatus, n. sp. (vel Stylosphcera jugata), 



Fig. 3. Lithatr actus fragilis, n. sp. (vel Stylosphcera fragilis), 



Fig. 4. Stylosphcera lithatractus, n. sp., .... 

 The entire shell. 



Fig. 5. Stylosphcera lithatractus, n. sp., . 



The greater part of the cortical shell and the two spines taken off. 

 The description of Stylosphcera lithatractus (intermediate between 



Stylosphcera jugata and Stylosphcera terpsichore, p. 137) is by 



mistake not given in the text. 



Fig. 6. Stylosphcera calliope, n. sp., 



Fig. 7. Stylosphcera, clio, n. sp., 



Fig. 8. Druppatractus ostracion, n. sp., . 

 The entire shell. 



Fig. 9. Druppatractus ostracion, n. sp., . 



The anterior half of the cortical shell has been removed. 



Fig. 10. Druppatractus hippocampus, n. sp., 

 The entire shell. 



Fig. 11. Druppatractus hippocampus, n. sp., 



The greater part of the cortical shell has been removed. 



Fig. 12. Stylosphcera nana, n. sp., . 

 The entire shell. 



Fig. 13. Stylosphcera nana, n. sp., . 



The greater part of the cortical shell taken off. 



Fig. 14. Sphcerostylus ophidium, n. sp., . 

 The entire shell. 



Fig. 15. Sphcerostylus ophidium, n. sp., . 

 The medullary shell alone. 



Fig. 16. Saturnulus ellipticus, n. sp., 



Fig. 17. Saturnulus planetes, n. sp., 





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