328 TUEBONILLA. 



II. Species of East Coast of the United States and West Indies. 

 T. EMERTONI, Yerrill. PL 75, fig. 6. 



White, lustrous; whorls 11, not very oblique, broadly 

 rounded, a little flattened on the sides, suture strongly im- 

 pressed ; surface with slight, rather indistinct and irregular 

 longitudinal furrows, which are often absent. 



Length, 4- 8 mill. 



Martha's Vineyard. 



Smaller than T. nivea, Stimp., with a larger nucleus and less 

 distinctly ribbed. 



T. NIVEA, Stimpson. PI. 75, fig. 11. 



White, shining ; whorls 11, flattened, longitudinally straightly 

 ribbed ; the interstices smooth, nucleus small, prominently 

 upturned. ^Length, 7 mill. 



Maine, northwards. 

 T. RATHBUNI, Verrill and Smith. PI. 75, fig. 5. 



White; whorls 12, rather convex, suture impressed; whorls 

 rather flattened, crossed by about 30, smooth, even, longitudinal 

 ribs, intervals as wide, showing eight or ten spiral strijE. 



Length, 13 mill. 



New England, deep water. 



Dr. Jeffreys considered this to = T. rufa, Phil., of Europe. 



T. ELEGANS, Yerrill. PL 75, fig. 8. 



Light yellowish ; whorls 10 or more, well-rounded, not dis- 

 tinctly flattened, with rather deep suture ; surface lustrous, with 

 numerous rounded longitudinal ribs, narrower than the concave 

 interspaces, fading out below the middle of the last whorl, and 

 with numerous revolving grooves, interrupted by the costse, but 

 continuous on the lower part of the body-whorl ; sometimes 

 there is a darker band on the middle of the last whorls and the 

 revolving striae are darker. 



Narragansett Bay, Vineyard Sound, Long Island Sound. 



T. AREOLATA, Yerrill. PL 75, fig. 9. 



Whorls 8 or 10, moderately convex, somewhat flattened in the 

 middle, crossed by about 25 longitudinal ribs, the interstices 

 with rather conspicuous impressed spiral lines, dividing them 



