PLATE II. 



Fig. 1. Dentalium yokohamense, n. sp. 



a. The shell, natural size. 



Fig. 2. Dentalium ensiculus, JefFr. 



a. The shell, enlarged. 



b. The transverse section of the same near the 



mouth. 



Fig. 3. Dentalium tornatum, n. sp. . 



a. The shell, enlarged. 



b. e. The enlarged representation of the sculpture 



at different points. 



c. The natural size of the shell. 



Fig. 4. Siphodentalium platamodes, n. sp. . 



a. The natural size of a young specimen of the 



shell. 



b. The same, enlarged. 



c. The transverse section of the same at the mouth. 



Fig. 5. Siphodentalium tytthum, n. sp. 



a. The enlarged representation of the shell. 



b. The natural size of the same. 



c. The enlarged representation of the apex. 



Fig. 6. Siphodentalium pusillum, n. sp. 

 a. The enlarged figure of the shell. 



Fig. 7. Siphodentalium dichelum, n. sp. 



a. The natural size of the shell. 



b. The enlarged representation of the shell. 



c. The transverse section of the shell in the middle. 



Fig. 8. Siphodentalium tetraschistum, n. sp. 



a. The enlarged representation of the shell. 



b. The natural size of the same. 



Fig. 9. Siphodentalium prionotum, n. sp. . 



a. The enlarged representation of the shell. 



b. The transverse section of the same towards the 



mouth. 



Fig. 10. Siphodentalium eboracense, n. sp. 



a. The enlarged representation of the shell. 



Fio\ 11. Siphodentalium honoluluense, n. sp. 



a. The enlarged representation of the shell. 



b, d. The transverse sections of the same near the 



apex and near the mouth. 



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c. The enlarged representation of the sculpture 

 at different points. 



The natural size of the shell. 

 The enlarged representation of the apex and 

 fissure. 



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d. The enlarged representation of the tip, showing 

 the small projecting pipe in prolongation of 

 the bore. 



d. The enlarged representation of the sculpture. 



e. The natural size of an older specimen. 

 /. The enlarged representation of the same. 



e. The transverse sections of the shell toward 

 the apex and mouth 



| b. The natural size of the same. 



d. The enlarged representation of the apex. 



e. The enlarged representation of the mouth. 



c. The enlarged representation of the apex. 



d. The enlarged representation of the mouth. 



c. The natural size of the shell. 



d. The enlarged representation of the apex. 



e. The enlarged representation of the mouth. 



b. The natural size of the same. 



c. The natural size of the shell. 



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