from a quick internet search about these HYDRACTINIAS (this one is
from the Pacific, c/o WWW.WALLAWALLA.EDU)...


On 8/7/11, Marlo Krisberg <[log in to unmask]> wrote:
> 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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