Display consecutive but not all items passed from XML

Hello:

How would I tweak the Kirupa Squirrel Finder XML example to populate the item_mc from the top to display, for example, species 1 to 5 or 5 to 10 instead of displaying all species?

I tried setting the initial item count at a non-zero number n and it just starts at the nth position and displays all of them. a nested for loop, perhaps?

Thanks.