Pyura gangelion(?)

Date: 23 June 2015, Species: Pyura gangelion(?)

I used to think these were empty coconut shells, until I noticed they move when I moved closer. I have since learned that they come from the Sea Squirt family (Ascidians), and some of their family members (Pyura chilliness) is eaten as a delicacy in some countries.    

                                          

Raalhu Bis (Sea Urchin test)

Came across this beautiful Raalhu Bis (Sea Urchin test), while snorkeling in Olhuveli Lagoon.