Crab Legs are everyday. I think you are reading the allears menu incorrectly
If you look at the quote, crab legs do not have specific days. It is the Batter Fried Shrimp the days are referring to
Seafood Selections - Steamed Mussels with Tomato Fennel Broth, Fried Clam Strips, Paella (Sun, Mon, Wed, Thurs & Sat), Bacalao (Tues & Fri), Snow Crab Legs, Steamed Clams, Herb-Marinated Salmon, Batter-Fried Shrimp (Sun & Wed), Batter-Fried Calamari (Tue & Fri), Fried Cod Nuggets (Mon, Thurs & Sa