Tropaeas gracilis
Tropaeas gracilis is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

References

 Higo, S., Callomon, P. & Goto, Y. (1999). Catalogue and bibliography of the marine shell-bearing Mollusca of Japan. Osaka. : Elle Scientific Publications. 749 pp.

External links
 To World Register of Marine Species

Pyramidellidae
Gastropods described in 1854