{BioShock} Is there a list of how many Little Sisters to expect in each area?

I was playing through Neptunes Bounty, and on the 'pause' screen, it said 3 Little Sisters in this area.

Fine, except I came across a 4th, and the screen showed 4/3 Little Sisters rescued. Cool, a bonus one, I thought.

However, just before I was returning to Peach Wilkins, a reminder came onscreen that said I have not harvested all the Little Sisters in this area. So, I went back through the level, followed around 3 different Big Daddies banging on air ducts, but no more Little Sisteres!!!!!

Is this a glitch? Does anyone know of a list online that tells where the Little Sisters can be found? Gamefaqs.com doesn't have any postings yet. I'm kind of a completionist, and I want the Achievement for "Dealing with all the Little Sisters"!!!

Thanks for any help...

Pause the screen and and look towards the bottom.Shade-Blade

i dont think u read his question.

anwyays i never heard of a bonus little sister, it may be a glitch u might jsut wanna research around or gamefaq forums