PLATE XI. 



Fig. 



1. Trochus obsoletus, p. 63. 



la. magnified view. 



2. Monodonta Labadyei, p. 68. 



3. Monodonta imbricata, p. 67. 



3a. magnified view. 



4. Monodonta Lyellii, p. 67, front view. 

 4. back view. 



46. the shell magnified. 



5. Turbo Gomondei, p. 66. 



6. 6a. Monodonta formosa, p. 68. 



66. magnified view. 



7. 7a. Delphinula (Crossostoma) discoideum, p. 73. 



76. magnified view. 



8. Delphinula (Crossoatoma) heliciforme, p. 73. 



9. Turbo obtusus, var., p. 66. 



9o. magnified view. 



10. Turbo obtusus, p. 66. 



10o. magnified view. 



11. 11 a. Monodonta Labadyei, p. 68. 



12. Neritopsis sulcosa, p. 59. 



13. Neritopsis striata, p. 59, front view. 

 13a. back view. 



14. Nerita hemispheerica, p. 58, front view. 

 14a. back view. 



15. Nerita cancellata, p. 56, front view. 

 15a. back view. 



156. a portion of the surface magnified. 



16. 16<z, Nerita hemisphserica, p. 58, a smooth variety. 



17. 1 "a. Nerita rugosa, p. 56. 



18. 18a. Nerita costulata, p. 57. 



186. a portion magnified. 



19. 19a. Nerita minuta, p. 58. 



20. 20<z. Neritopsis varicosa, p. 106, and Plate XIII, fig. 5. 



21. Delphinula (Crossostoma) Prattii, p. 77. 



2 la. an enlarged view. 



22. Natica (Euspira) Sharpei, p. 46. 



23. Natica (Euspira) caualiculata, p. 45. 



23. back view. 



24. Natica Strickland!, p. 42. 



24a. back view. 



25. 25a. Phasianella tumidula, p. 76. 



26. Phasianella nuciformis, p. 75. 



27. 27<z. Phasianella elegans, p. 74. 



28. 28o. Phasianella acutiuscula, p. 75, and Plate IX, fig. 2. 



29. Phasianella parvula, p. 75. 



29. magnified view. 



30, 30a. Phasianella conica, p. 74. 



31, 3 la. Phasianella Leymeriei, p. 74. 



32. a globose variety. 



