Absolutely right. In the next stitch work 1 dc ch 1 1 dc. These three steps are what is going to create your shell look, that's why they must be in the same stitch.
By
10/19/2011
The pattern might tell you right before or after the shell instructions. Usually there is a chain one space in the preceding row that lines up with your shell. Don't be afraid to try it out. You can always pull the stitches out and put them somewhere else until you find the way that lays flat. Good luck!
By
10/19/2011
Both double stitches go in the same place (in the same stitch).
By
10/19/2011
"work shell of 1dc, ch1, 1dc"
This means that you do "1dc, ch1, 1dc" all in the same stitch.