Thanks guys!

All of your suggestions are very possible in my case. Yup, my finger rests against the hinge of the easel. It pretty sure that I didn't get the paper (Ilford MGIV) wet prior to development, but in a 5x9 foot space with running water on one end, you just never know...

The easiest solution (and the required one) is to make another print. My query here was to try and identify the culprint, so as not to repeat the mistake.