I have two Sea Shells that I would like to know more about if possable

The First one has alot of Spines on It.



And The Second One

The spiny shell is one of several similar species in the genus Murex. I believe this one is Murex acanthostephes from northern Australia. It doesn't have an English name that I know of.

http://www.gastropods.com/2/Shell_4742.html

The other one is Tibia fusus, sometimes called the Spindle Tibia or Shinbone Tibia, a common deep water species from the southwest Pacific area.

http://www.gastropods.com/4/Shell_234.html

Thanks Paul I just recently started getting curious about the sea shells that I have. Im trying to id most of my current collection. Another one Im curious about is this one.

This is (or was!) a Top Shell in the genus Trochus. In its natural state it looked something like this:

http://www.reef.crc.org.au/research/fishing_fisheries/statusfisheries/harvesttrochus.htm

Then the outer layer of shell was ground or etched away to reveal the underlying pearl layer, and the shell was polished, so it looked something like this:

http://www.outerbankssouvenirs.com/browseproducts/Pearled-Trochus-niloticus-ss65b.HTML

Then the sides of the shell were cut away to make the decorative item you have.