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. 

 2a. — magnified. 



23. — front view. 



3. Trochus Dunkeri,jo. 61. 



3a. — — magnified. 



4. Trochus Ibbetsoni, p. 62. 



4#. — — magnified. 



5. Trochus pileolus, p. 63. 



5a. — — magnified. 



53. — — another example. 



6. Pleurotomaria clathrata, p. 79. 



6a. — — magnified three times. 



7. Trochus anceus, p. 63. 



7a. — — specimen magnified. 



8. Trochus plicatus, p. 61. 



8a. — — magnified. 



9. Pleurotomaria pagodus, p. 77. 



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

 10a. — — magnified. 

 103. — — side view. 



10c. — — costse magnified. 



11. Pleurotomaria obesa, p. 79. 



12. Pleurotomaria discoidea,^?. 78. 



13. Pleurotomaria composita, p. 80. 



13a. — — portion magnified. 



14. Pleurotomaria scalaris, p. 77. 



15. Trochotoma obtusa, p. 83. 

 15#. — — front. 

 153. — — back view. 



16. Trochotoma conuloides, p. 82. 



17. Trochotoma tabulata, p. 83. 



17«. — — front view. 



18a. Trochotoma obtusa ?,p. 83, base. 



183. — — surface magnified. 



Ida. Trochotoma extensa, p. 83. 



193. — — back view. 



20. Trochotoma acuminata, p. 82. 



