Nora,
 
The argonaut shell is indeed an egg case developed by the female
argonaut.  The males are much smaller than the females and without
shell.
 
Tom
 
NORA BRYAN wrote:
>
> Thanks David, I forgot to acknowledge you in my earlier Reply (somehow your
> reply wasn't connected to the thread).  I thought that the Argonaut shell was
> an egg case, and therefore solely female.  I need to do some more reading I
> guess.
> Nora Bryan
> Calgary, Alberta
> Canada