Aeolid from northern Mariana Islands

Dear Gon,
Like the animals from Jervis Bay you refer to, this is most probably a species of Cuthona. Quite a lot of them have a reddish orange band on the rhinophores. Identifying them is quite difficult unless they are one of the species which has a very distinctive colour pattern based on skin pigment. Many have a colour pattern which to a large extent is based on the colour of the digestive gland - and thus their food. Many have also been described on the basis of very few specimens so we have no idea of their colour varaibility. This is especially true of Indo-West Pacific species. At this stage it is difficult to know just how wide spread some of the described species are.

If anyone is willing to give us their opinion it will be very welcome. It is possible there is a description out there which fits this colour pattern precisely, but it is a bit like a lottery. So I am afraid at present I am going to have to leave this in an unidentified list.
Best wishes,
Bill Rudman