Here're some photos.

http://z14.invisionfree.com/Conchologist_Forum/index.php?showtopic=2204

Steve, I also find the black scum on this shell and N. acutus. Thanks for offer of shells, but check out posting on this shell.

Marlo

-----Original Message----- From: steve rosenthal Sent: August 07

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.

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

On 8/7/11, Harry G. Lee 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. > -------------------------------------- > 8/7/2011, Marlo wrote:

None of the descriptions I have 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?

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