You are admiring an amazing creature & a miraculous specimen, a very rare Stellaria gigantea (Schepman, 1909) measuring a very nice 97.9mm...incredible form is displayed on this most interesting, very deep H2O specimen.  This beauty was trawled at 400m offshore Taiwan.  A very rarely seen member of the fascinating Xenophoridae family...which are known as being the original shell collectors.  Because of it's rarity, it is certainly going to be an outstanding addition for your collection & one, I think you will be very pleased to display.  They are extremely interesting & what I call miracles of nature.  Thanks for visiting our store this afternoon...& an excellent choice as this is one of those species that does not pass our way very often.