Now It's Getting Closer to the Real Thing! **

Images say it all:-

The X ray is drawn from Internet images.  There are many online,  eg  www.sciencephoto.com/media/438998/v

The tiny triangle at right top might be useful for helping to stitch the top of the whorl.
The top left hand corner, 34,  sits halfway around the outside of the last 89 row and is stitched from the inside;  quite tricky.


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A skewed fibonacci hyperbolic fan shape.

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Here next is the nicest little seashell model made last year.  Knitted in 1 ply tapestry wool.
Cast on 34 stitches and work as per tiny diagram... Yellow is 89 stitches;  12 rows at lip edge, 8 rows in middle and 4 rows inner section...
The brown line is embroidered on.  I wanted to try to duplicate the spiral stripe that goes up the tiny whelk like shells that you get in chook feed shell grit.
Images show model stitched from inside and from outside.

Still it is a far cry from an exact model. The intricate elegance of the top whorls still eludes me.
I think on the poem "Tree"  by the soldier poet Joyce Kilmer:-
"I think that I shall never see
a poem lovely as a tree.....
Poems are made by fools like me
But only God can make a tree."
For me it reads
"Models are made by fools like me
But only God can make a real seashell."

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Update 16th April 2014

I have promised to spell out the Crochet Pattern in response to a young lady's request after "A Proper Pattern" of 1/19/2012.

Please see the 1 page diagram to crochet 8 to 13, 13 to 21, 21 to 34, 34 to 55 and 55 to 89
on post of 2/1/2014.  Here it is:-    I think it is easy to understand whether you crochet or knit (tho sometimes one needs to knit from the top down....)  You can figure out how to increase (work twice in same stitch) or decrease ( skip a loop for crochet or do a 2 half crochets and then pull the yarn thro both loops to make one.   Or Knit 2 together to decrease.)  I hope you can figure out how to make the models chiefly from the diagrams.  I don't think I can bear to write it all out stitch by stitch!

 Just experiment.  You might make some good discoveries!  Page 2 from 2/1/2014 post also runs to higher numbers.  You might have good results if you make a Seashell with 377 or 610 stitches.  I am planning to make some with spikes and bumps.

*************************Good Luck!****************