Favorinus blianus - first record from W. Atlantic

Dear Paul,
When I first saw this photo the white Y-shaped pattern on the head reminded me of Flabellina lineata which is only known from the northeastern Atlantic. However after a couple of days thinking about it I am pretty sure it is another species, Favorinus blianus which as far as I know is another species which has only been found in the northeastern Atlantic.

The only thing I am not quite sure of is the shape of the rhinophores, which in F. blianus have three large swollen rings. The shape is not clear in your photo [which I've enlarged alongside] but there does appear to be a large swelling below the white tips which could be the rings contracted into a 'lump'. If you have another photo which shows the rhinophores more clearly it would be very welcome.

I am very glad I asked you to share some of your photos with us. They are certainly proving to be very interesting.
best wishes,
Bill Rudman