PLATE X. 

 Fig. 



1. Trochus Bunburyi, p. 63. 



la. magnified three times. 



13. back view. 



2. Trochus spiratus ? var.,p. 106, and Plate XIII, fig. 6. 

 20. magnified. 



23. front view. 



8. Trochus Dunkeri, p. 61. 



30. magnified. 



4. Trochus Ibbetsoni, p. 62. 



40. magnified. 



5. Trochus pileolus, p. 63. 



50. magnified. 



53. another example. 



6. Pleurotomaria clathrata, p. 79. 



60. magnified three times. 



7. Trochus anceus, p. 63. 



70. specimen magnified. 



8. Trochus plicatus, p. 61. 



80. magnified. 



9. Pleurotomaria pagodus, p. 77. 



10. Trochotoma discoidea, p. 84, upper surface. 

 100. magnified. 

 103. side view. 



10c. costae magnified. 



11. Pleurotomaria obesa,jt?. 79. 



12. Pleurotomaria discoidea, p. 78. 



13. Pleurotomaria composita, p. 80. 



130. - portion magnified. 



14. Pleurotomaria scalaris, p. 77, 



15. Trochotoma obtusa, p. 83. 

 150. front. 

 153. back view. 



16. Trochotoma conuloides, p. 82. 



17. Trochotoma tabulata, p. 83. 



170. front view. 



180. Trochotoma obtusa ?,jo. 83, base. 



183. surface magnified. 



190. Trochotoma extensa, p. 83. 



193. back view. 



20. Trochotoma acuminata, p. 82. 



