192 BULLETIN 37, UNITED STATES NATIONAL MUSEUM. 



PLATE XLVI-Continued 



FIG. 16. Dentalium candidum Jeffreys ; 75.0 ; 



17. The same, young shell ; 35.0. 



18. Dentalium laquealum Verrill ; 45.0. 



19. Cadulus speciabilis Verrill ; 22.0. 



20. Cadulus grandis Verrill ; 12.5. 



21. Pseudamusium undatum Verrill & Smith ; 19.0. 



22. Cryptodon grandia Verrill ; 21.0. 



23. Barbatia (Macrodon I) profundicola Verrill ; 12.0. 



23. The same, interior of left valve. 



24. Discimsca atlaiitica King; 6.2; view from above, the etse projecting from 



the shell. 



With the exceptions mentioned, the figures above enumerated first appeared in the 

 Transactions of the Connecticut Academy of Sciences (vol. vi, pi. xliv). They were 

 drawn under the supervision of Prof. A. E. Verrill, for the U. S. Fish Commission, by 

 Messrs. J. H. Blake and J. H. Emerton. 



PLATE XLVII. 



FlG. 1. Melampus flavus Gmelin ; 12.0. 



2. Melampus floridanus Shuttleworth; 7.5. 



3. Melampus cofftus Liiine", uat. size. 



4. Pedipes elongatus Dall ; 4.0. 



5. Tralia pusilla Gineliu ; 11.0. 



6. Pedipes unisulcatus Cooper, west coast of America. Introduced for compar- 



ison. 



7. Detracia bulloides Montagu ; 11.0. 



8. Auriculastrum pellucens Menke; 16.0. In old specimens the peristome be- 



comes rather thick. 



9. Melampus lineatus Say ; nat. size. 



10. Sayella Crosseana Dall ; 2.5. 



11. Sayella Hemphi llii Dall ; 3.75. 



12. Melampus lineatus Say, typical or banded form, nat. size. 



13. Leuconia bidentata Montagu. 



14. Blauntria heteroclita Montagu. 



15. Pedipes liratus Binney ; 3.3. This is extremely similar to P. mirabilis Muhl. 



feldt, the common species of the Antilles, Bermuda, and the Florida 

 region. It is introduced for comparison. 



16. Melampus olii'aceus Carpenter, nat. size. West America. 

 17. Ptdijies mirabilis Muhlfeldt, var. naticoides Stearns ; 3.6. 



Figures 4, 6, 8, 10, 11 were drawn by J. C. McConnell, and have appeared in the Pro- 

 ceedings of the National Museum; Fig. 17 \vas drawn by Prof. E. S. Morse ; the re- 

 mainder are extracted from Binney's Land and Fresh Water Shells of North America, 

 published by the Smithsonian Institution, and were furnished by the Institution for 

 this publication. 



