Dominica worm-larvae-egg casing?

At 25 feet, sand, turtle grass:

Approx. 5 inches long, couldn't distinguish one end from the other.

This was somewhat of a strange encounter. There was a small eel that seemed to be in a hurry to bury itself in the sand (tail first), when I swam over to take a closer look, this thing was right where the eel disappeared. I thought maybe the eel disrupted or dislodged it. It very quickly burrowed under the sand itself.

Thanks, Bud

I am no expert, but this looks like some type of sea-cucumber to me...

Anythings possible but it didn't seem to have the right "texture". At least not like the sea cucumbers I'm familiar with.

Thanks for the reply Luiz.

Bud

i think thats the spoon worm itself, not just the proboscis

Matt,

Did you take a look at my last reply on the post titled Dominica Unknown "Slug"

After looking at the link provided by Leslie, I'm pretty sure the picture I posted there is the spoon worm. It was certainly in closer proximity to the proboscis and has more of a "spoon worm physique"..

Bud

I'm not sure about this one. To use the classic taxonomist's reply, I need to see a specimen. It could be an echiuroid but probably not. It could be a sipunc but not Sipunculus. It might be a sea cucumber but there are too many muscle bands. It might be a burrowing anemone. Hmmmm... the gut coils look more like a Sipuncula. So I'll stick with that until someone corrects me & then I'll swear that's really what I was thinking..... ;-D