PLATE 16. 



Stylosph^erida et Druppulida. 



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



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



Fig. 3. Lithatractus 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. Stylosphara nana, n. sp., . 



The greater part of the cortical shell taken off. 



Fig. 14. Sphairostylus ophidium, n. sp., . 

 The entire shell. 



Fig. 15. Spharostylus ophidium, n. sp., . 

 The medullary shell alone. 



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

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



Diam. 

 x 300 



x 400 



x 400 



x 300 



x 300 



x 300 



x 300 



x 300 



x 300 



x 300 



x 300 



x 300 



x 400 

 x 400 



135 

 323 

 319 



x 400 



134 



x 400 



134 



x 300 



326 



326 



324 



324 



136 



136 



140 



140 



141 

 142 



