I can maybe partially answer this.

We often find very dead crabbed specimens of this shell with an
epibiotic covering which I believe may be a hydrozoan.

Often live specimens of this shell have a dark deposit of some kind of
stuff on them which I never have figured out what it was, bleaching
doesnt remove it, and scraping didnt seem to do much either. It is not
unlike stains I see on deep water shells, like buccinids or volutes
(Fulgorarias) eg from the Chinese dealers.

(Marlo, if you want I can send you some examples, let me know).

On 8/7/11, Harry G. Lee <[log in to unmask]> wrote:
> I believe you're seeing some kind of epibiont, but I can't recall what
> it is and haven't time to launch an investigation.
>
> Harry
>
>
> On 8/7/2011 2:31 PM, Marlo Krisberg wrote:
>>
>> None of the descriptions I have of this shell indicate the presence of
>> a periostracum.  However, many I've seen do have what appears to be a
>>  light to very heavy, brushy periostracum.  Does Ilynanassa trivittata
>> have a periostracum or am I seeing some other growth?
>>
>> */Marlo/*
>>
>
>
> --
> Harry G. Lee MD
> 4132 Ortega Forest Drive
> Jacksonville, FL 32210-5813
> USA
> (904) 389 4049
> [log in to unmask]
> [log in to unmask]
>
>

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