Observation #2

My MicroAquarium has a lot of life in it, and it's harder than I thought to identify all of it. Here's what I've seen so far:
Flatworm: (Platyhulminthes) Found on the fuzzy of the rwo plants in the middle water, this flatworm has a defined head. I positively ID'd it using Pennak's "Fresh-Water Invertebrates of the U.S."
Spirostomum: (a Ciliate) Found in the dirt at the bottom. I positively ID'd it using Rainis's "Guide to Microlife."
Euglena: Found near both soil and plants. It's dark green,with an open spot in the center, with a red dot in the "head." It moves slowly, and folds over itself to change direction.  Dr. McFarland identified that one for me, and I read up on it in various books.