Unable to delete any iTunes U lectures - please help

I downloaded a bunch of audio and video lectures directly to my 64GB iPod Touch. I would like to keep them on my iPod and not sync them to my laptop, which does not have room. Once I listen to lectures, they are marked as read, yet I cannot delete them directly on my iPod.
I also tried connecting the iPod to my laptop's iTunes and checked the iPod's iTunes U list through there (leaving the Sync iTunes U check box unchecked): Though I can highlight lectures, I still see no way to delete them. Please help.
Is there some way I can just delete them? Or will the system force me to sync all iTunes U with my laptop's iTunes?

Hi,
Does right-clicking on the lecture bring up anything useful? Maybe when you highlight it, you can delete it through Edit>Delete?
Hope this helps!

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