PLATE I. 



Fig. 1. Dentalium capillosum, Jeffr. 



a. The shell, natural size. 



h. The apex of one specimen, curiously fissured. 



c. The natural size of the same. 



d. The enlarged representation of the sculpture 



towards the mouth. 



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e. The young shelL 

 /. The natural size of the same. 

 g, h. The enlarged representation of the sculpture 

 at different points. 



Fig. 2. Dentalium cegeum, n. sp. 



a. The shell, natural size. 



6. The apex enlarged, showing the fissure. 



Fig. 3. Dentalium amphialum, n. sp. 



a. The shell, natural size. 



b. The enlarged representation of the fissure. 



Fig. 4. Dentalium keras, n. sp. 



a. The shell, natural size. 



b. The enlarged representation of the fissure. 



Fig. 5. Dentalium diarrhox, n. sp. 



a. The shell, natural size. 



b. The enlarged representation of the sculpture. 



Fig. 6. Dentalium leptoskeles, n. sp. 

 a. The shell, natural size. 



Fig. 7. Dentalium circumcinctum, n. sp. 



a. The shell, natural size. 



b, c, d. The enlarged representation of the sculp- 



ture at different points. 



Fig. 8. Dentalium acutissimum, n. sp. 



a. The shell restored, natural size. 



b, c. The enlarged representation of the sculpture 



at different points. . 



Fig. 9. Dentalium compressum, n. sp. 



a. The shell, enlarged. 



b. The enlarged section, showing the compression 



between the convex and concave curve of the 

 shell. 



Fig. 10. Dentalium subterfissum, Jeffr. 



a. The shell, enlarged. 



b. The enlarged representation of the sculpture. 



Fig. 11. Dentalium didymum, n. sp. 



a. The shell, enlarged. 



b. The enlarged representation of the sculpture. 



c. The transverse section of the shell near the 



mouth. 



c, d, e. f. The enlarged representation of _the sculp- 

 ture at different points. 



c, d. The enlarged representation of the sculpture 

 at two different points. 



c. The enlarged representation of the sculpture at 

 two different points. 



c. A young specimen. 



d. The enlarged representation of the fissure. 



b, c. The enlarged representation of the sculpture 

 at different points. 



e. The enlarged representation of the fissure. 



d. The enlarged representation of the fissure. 



c. The enlarged representation of the sculpture 



near the mouth. 



d. The natural size of the shelL 



c. The natural size of the shelL 



d. The enlarged representation of the fissure. 



d. The enlarged figure of the apex, showing the 

 small round orifice and thick walls of the 

 shell. 



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