Our northwest coast is also sometimes visited by Janthina.
In the mid 1960's Alan Rammer (Olympia, Washington) donated specimens of J.
exigua found at Westport, Washington and Bruce Schulz (Eugene, Oregon)
donated specimens of the same species collected  at Devil's Elbow State
Park's "Hobbit Beach" on the Oregon coast.
 
Tom Rice
At 01:32 PM 5/22/98 -0400, you wrote:
>Dear Conch-L..ers, You may be surprised to know that towards the end of a
>warm summer we occasasionally find Janthina janthina on the southernmost
>tip of Ireland, courtesy, I presume of Gulf Stream Travel.   I found about
>a dozen one morning after a storm on the beach beside Waterville Golf Club.
> A few years later   I was told by Dr Dai Roberts (Queens University
>Belfast), that one of my finds was in fact a Janthina pallida, which had
>been mentioned by Nora McMillan in her book 'British Seashells', but it had
>not been  recorded since.  Stanley Francis.
>