476 PROCEEDINGS OF THE ACADEMY OF [1897. 



Figs. 15, 16. Dentalium dissimile var. ponderosum Gabb. Two 

 sections of one individual (PI. X, fig. 2) enlarged. 



Fig. 17. Cadulus colobus n. sp. Dorsal aspect, much enlarged. 



Fig. 18. Cadulus colobus n. sp. Aperture. 



Fig. 19. Cadulus colobus n. sp. Lateral aspect. 



Fig. 20. Cadulus colobus n. sp. Anal orifice. 



Fig. 21. Dentalium callioglyptum n. sp. Sculpture, much enlarged. 



Fig. 22. Dentalium Tryoni n. sp. Sculpture, much enlarged. 



Figs. 23, 24. Cadulus phenax n. sp. Lateral aspect. 



Fig. 25. Cadulus depressicollis n. sp. Outlines of aperture and 

 " equator." 



Fig. 26. Cadulus depressicollis n. sp. Lateral aspect. 



Fig. 27. Cadulus depressicollis n. sp. Ventral aspect. 



Fig. 28. Cadulus elegantissimus n. sp. Lateral aspect. 



Fig. 29. Cadulus elegantissimus n. sp. Outline of aperture. 



Fig. 30. Cadulus elegantissimus n. sp. Lateral aspect. 



