324 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 53. 



The large amount of material which we have seen of this species 

 makes it impossible for us to consider these distinct forms. 

 I have seen the follo^ving species: 



' Type. 



» Type of Eulima bistorta Vanatta. 



» Type of Eulima towei Vanatta. 



MELANELLA (BALCIS) COLUMBL\NA, new species. 



Plate 41, fig. 5. 



Shell large, rather stout, pohshed, ^^-ith a double flexure; when 

 viewed \\ath the aperture to the front it shows the early whorls bent 

 backward and the succeeding turns flexed to the right. Shell bluish- 

 white, except where the dried animal shines tlirough its substance; 

 there it has a granular, light brown to buff appearance. First tliree 

 turns well rounded, separated by a well-marked suture, the remaining 

 turns slightly rounded ^nth scarcely defined suture. The posterior 

 termination of the inside of the whorl sliines through the shell and 



