John,

Allonautilus perforatus can be differentiated from Nautilus
scrobiculatus by the distinct wrinkles radiating from the umbilicus
on each side.  The surface of the shell seems almost wavy (certainly
not a technical term!).  Though now known from more than a few
specimens, it is still quite rare in Indonesian waters.

Rich
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
www.worldwideconchology.com
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At 09:46 AM 1/26/2010, you wrote:
>Hi all,
>
>
>While researching nautiloids for a small project, A. perforatus was
>mentioned as being known from only a few specimens.  So far, I have failed
>to find a single photo of one on the web.  Can anyone supply me with a
>photo?  I came across a specimen at the Astronaut Trail Shell Show in
>Melbourne, FL labeled as such, but I want to confirm its identity.
>
>Thanks,
>John
>
>John & Cheryl Jacobs
>Seffner, FL
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