I was picking up some wood that had been sitting outside for 9 months, and among the earthworms I saw several critters I've never seen before. They look just like earthworms in color and texture, but they are quadrupedal, with distinctly wedge shaped heads. My reading here hinted at them being land planaria, but those seem to have cilia, not legs. What have I got here? I am in the NY Catskills.