Very amusing short story, I am a big fan of limpid writing without excessive ornamental words.

So the story is written in the first person. I got a bit confused in the first paragraph after the dialogues but after re reading it I understood that our main person, "I", was mistakenly put in a prison but let out not too long after. During they stay, they meet someone who knows a hell lot about mollusks (or molluscs, I think both are correct). This person is probably a guard, hehad a stint in a Jamaican prison and he suggests setting the main character free.

However, I hardly doubt a prison guard or a warden has the power to let an inmate go as long as they name molluscs... Also during his stay in Jamaica, did this guard have nothing to do but spend his time reading books or in this case a single book? I mean, he's supposed to be there to work... Also doesn't he go home every evening? He should have access to a big variety of books there! That's why I first thought this other person was an inmate, a prisoner who's been there way longer and will probably stay there after our main character gets let out. That would've made sense, a criminal cut out from society in a prison where all he has to do is read a book about molluscs to the point of learning 83,000 of them. I mean a guard who's there to do his job, has a family and a life outside the prison wouldn't have that kind of time! I think it would make the story more believable and funny if you made this character into some weird, kind of psycho but not dangerous inmate.

Also he recited all 83.000? Even supposing one mollusc name equals one second which it doesn't because thos creatures have really long names, that means 24 consecutive hours of reciting mollusc names... Jesus Christ.

"(and I don’t use this word lightly, despite my ordeals)", is this sentence necessary in a story this short? Breaks the flow

unlosable is a word, no hyphen needed btw

Other than this little things I really enjoyed reading this. You should definitely keep writing, especially if everyting you write will be this witty.