EXPLANATION OF PLATE XX. 



Strombina (Amycj.a) l.kvis Whitf. (p. 111). 

 Pigs. 1, 2, 3. Three views of a very perfect shell. 



4. View of a specimen which shows linings. 



Cancellaria alternata Conrad (p. 112). 



Figs. 5,6. Two views of an elongated specimen, enlarged three diameters. 

 7, 8. Similar views of a somewhat broader one. 

 9, 10. A still broader and larger individual, the back of which is broken and shows the plica 

 of the columella, enlarged two diameters. 



Terebra inornata Whitf. (p. 114). . 



Pig. 11. View of an eroded specimen, natural size, showing the condition in which thev are 



mostly found. 



12, 13. Two views of a specimen imperfect at the apex, but retaining the true features on the 

 parts preserved, enlarged two diameters. 



Terebra curvilineata Conrad (p. L13). 

 Pigs. 14. View of the apical portion of a shell, twice enlarged. 



15, 16. Two views of a specimen preserving only the lower volutions; the aperture still imper- 

 fect, enlarged two diameters. 

 17. A still further enlargement to show the spiral lines. 



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