We found this near Fort Pheonix in Buzzards Bay in Massachusetts. It gets long when its swimming (About 8 inches) and contracts when disturbed (2 inches).

Its head is shaped a bit like a diamond (like a cobra?). Its body looks fairly translucent and is ribbon-shaped.

Still image of swimming

Here's a short video: https://vimeo.com/240322590


It is possibly a milky ribbon worm (Cerebratulus lacteus).

enter image description here

source: intertidal-novascotia.blogspot.com

They can be found anywhere and everywhere along the Atlantic coastline in healthy abundance - http://intertidal-novascotia.blogspot.com/2012/05/cerebratulus-lacteus-milky-ribbon-worm.html


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