Finishing the shell

Here it is – the last few rounds of the shell!

Round 10: 24 sc (24)
Round 11: [sc, dec] x 8 (16)

Stuff the piece, shaping it so it's flat on the bottom.

Round 12: dec x 8 (8)

And you're done! You might be looking at your piece and wondering – now wait a minute. Why is there a giant gaping hole in the middle of my piece? 

Never fear, there's a tutorial here: