Dear Paul and all,
according to "A glossary of a thousand-and-one terms used in conchology" by
W.H. Arnold, 1965  terms inductuta (L inductura = a coating, a covering)
and callus are synonims. The latter is more often used.
Ed Heiman
----- Original Message -----
From: "Paul Kanner" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 24, 2002 2:53 AM
Subject: Re: Cypraea spadicea... nacre


> Stupid me. The expression "nacre" was not intended as the gist of the
issue.
> I realize that it was an error in terminology that only occurred once in
the
> posting.  I merely wanted to know if this type of encapsulation of a
foreign
> attachment was common and how it might occur.  However, thanks for keeping
> me honest and educating me on the term "inductura" of which I was unaware.
> That's an amateur for you.
>
> Paul Kanner
>
>
> ----- Original Message -----
> From: "Andrew Grebneff" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, October 23, 2002 12:21 AM
> Subject: Re: Cypraea spadicea... nacre
>
>
> > >In the strict technical sense, nacre-covered barnacles could only
> > >occur in Gaza or similar forms, as nacre designates mother-of-pearl.
> >
> > Correctly speaking the smooth internal glaze produced by gastropods,
> > which may in some taxa eg Cypraea extend over part or all of the
> > external surface is called inductura.