It's amazing what yo0u can find with google!

http://slugsite.us/bow/nudwk372.htm

and

Journal of Experimental Biology 207, 1043-1049 (2004) Published by The Company of Biologists 2004  Identifiable neurons inhibited by Earth-strength magnetic stimuli in the mollusc Tritonia diomedea   John H. Wang1,*, Shaun D. Cain2 and Kenneth J. Lohmann1   1 Department of Biology, University of North Carolina, Chapel Hill, NC 27599-3280, USA 2 Friday Harbor Laboratories, University of Washington, Friday Harbor, Washington 98250, USA   * Author for correspondence (e-mail: [log in to unmask])  Accepted 31 December 2003   Diverse animals use the Earth's magnetic field as an orientation cue, but little is known about the sensory, processing and motor elements of the neural circuitry underlying magnetic orientation behavior. The marine mollusc Tritonia diomedea has both a magnetic compass sense and a simple nervous system accessible to electrophysiological analysis. Previous studies have revealed that four identifiable neurons, known as LPd5, RPd5, LPd6 and RPd6, respond with enhanced electrical activity to changes in Earth-strength magnetic fields. Here we report that two additional neurons, LPd7 and RPd7, are inhibited by magnetic stimuli. Cobalt fills of the Pd7 neurons indicated that two prominent neurites emerge from the soma and project to the periphery through the ipsilateral cerebral nerves CeN6 and CeN3; in some cases, a third neurite was visible in CeN2. The nerves extend to the anterior region of the animal where they innervate the lateral body walls, oral veil and mouth region. Action potentials in the Pd7 neurons propagate from the central ganglia toward the periphery. Thus, the Pd7 cells have characteristics of efferent neurons. The precise function of these cells during magnetic orientation behavior, however, remains to be determined.    Key words: Tritonia diomedea, magnetic, magnetoreception, orientation, navigation, mollusc

> ----------
> From:         Avril Bourquin
> Reply To:     Conchologists of America List
> Sent:         Thursday, February 12, 2004 17:20 PM
> To:   [log in to unmask]
> Subject:      LUNAR MAGNETIC MOLLUSC
>
> Wedi ei archwilio am feirysau gan Amgueddfeydd ac Orielau Cenedlaethol Cymru. Checked for viruses by National Museums & Galleries of Wales.
>
>
> An old 1987 article "LUNAR MAGNETIC MOLLUSC" was brought to my attention.  It is at:  http://www.science-frontiers.com/sf050/sf050p11.htm    Does anyone know of newer information on this subject?
>
> Best regards,
> Avril
> Avril Bourquin
> P.O. Box 366
> Invermere, B.C.
> Canada
> V0A 1K0
>
> Email:  [log in to unmask]
> Phone/Fax:  (250) 342-7224
> URL:  http://www.manandmollusc.net
>
>
>
>


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