PLATE II. 



PAGE 



Fig. 13. Ranella Mathewsonii. Natural size. 8 



Fig. 14. Cuma biplicata. Natural size. 9 



Fig. 15. Ancillaria Fishii. Natural size. 9 



Fig. 16. Columbella Richthofeni. Magnified. 10 



Fig. 17. Neverita callosa. Natural size. 10 

 View of the base. 



17 a. Side view to show the form of the callus. 



17 b. Top view. 



Fig. 18. Cancellaria (Euclia) tritonidea. Natural size. 11 



Fig. 19. C. (E) Vetusta. 12 



Magnified to nearly twice natural length. 



Fig. 20. Bittuim aspertjm. Magnified. 12 



Fig. 21. Malania Taylori Natural size. 13 



Fig. 22. Lithasia antiqua. Magnified. 13 



Fig. 23. Littorina RGmondii. Magnified. 14 



23, 23 a. Two extreme forms of a variable species. 



Fig 24. Turritella Hoffman nii Natural size. 14 



Fig. 25. Trochita filosa. Natural size. 15 



25 a. Side view. 



