They aren't Julies.....or false julies, so stop guessing those, people.
And they aren't Corydoras pygmaeus aka Pygmy Cories.
I agree on the Bilineatus or Nanus. To me, they look more like Nanus, but that's just from the colors in your pics and the colors on the PlanetCatfish pics....and the markings on the heads look more like Nanus to me than Bilineatus.
And since they came in as Nemus (where did that come from?)
I'm gonna lean towards Nanus. But, the two look very similar.
Can you post some bigger pics, Andrew?