Yeh, Im thinking its like a 'Queen Bee' type of egg-producing sack.
I just noticed that she looks kinda sad in that picture...
Hey! I just noticed that Sam is basically every Muds Ma. Thats what they must of been reffering to when they say, "And dont even worry about Abes long-lost mother....yet. Youll find that out when you meet Munch", at the end of AE. (Ok, shuddup, I dont have MO yet
.)