Lose the number of one's mess

"What do you think we come to sea for? If we can take a man-of-war of our own size she's worth half a dozen merchant craft, though, to be sure, some of us may lose the number of our mess; but we all know that, and make no count of it."

Shore folk think sailors are heartless, and that when a poor chap is lost overboard, they only say that "So-and-so has lost the number of his mess!" and, after having an auction over his kit in the fo'c's'le, then dismiss him from their memory!

"And then before the mast, there was poor John Proby, who lost the number of his mess two days out of Callao."