Pistol Shrimp - What is it?

[hfp75]

On Feb 2nd I bought a Pistol Shrimp & Goby. All was well. I got home and found that my shrimp had a large deformation on this Left side. I phoned the store I got it at (will hold the store name back) & emailed the guy at the store (who happens to be the owner) these same 5 pictures. I was told the shrimp is molting.

Being new to this I figured he (fish store guy) knew what was going on and added the shrimp to my tank. Now on the 13th - yes 11 days later I am still curious. I saw the shrimp yesterday and the BULGE is still there - it has not changed at all & the shrimp seems active - when I can see him.

Today I re-emailed the store and have not received anything back as of yet.

My question - What is it? I'd love opinions... or better yet facts? The bulge has a little black dot/spot inside it at the front.

PICS:
http://s101.photobucket.com/albums/m...t=IMG_1757.jpg

http://s101.photobucket.com/albums/m...t=IMG_1766.jpg

http://s101.photobucket.com/albums/m...t=IMG_1762.jpg

http://s101.photobucket.com/albums/m...t=IMG_1761.jpg

http://s101.photobucket.com/albums/m...t=IMG_1756.jpg