I agree with David that your animal sounds like the "angel wing", Cyrtopleura costata. You are pretty close to the northern extreme of the geographic range for that species. It is more common farther south. If it is the angel wing, it's a lot of work to get one. You have to dig a deep hole, parallel to the animal's burrow, sometimes as deep as two feet, then tunnel in from the side until you find the critter. If you try to dig straight down the burrow, you will invariably hit the shell with your shovel and break it (the shell, not the shovel). Also, if you succeed in digging out a live specimen, you should immediately transfer it into a bucket of sea water, to keep it relaxed. Otherwise the animal may contract its muscles so strongly that it breaks its own fragile shell. The shell can be obtained by gradually raising the temperature of the water until the animal expires, but don't let the water get excessively hot - again the shell is quite fragile. An alternate method is to add epsom salts (magnesium sulfate) to the water until the animal is "narcotized". Paul M.