There is actually much more! Here again is the Pattern for crocheting (and for knitting) a mollusc, even to an ambitious degree of 4181. If you click on the image it enlarges ok and you can print it or copy and save it to Word for your Reference as a Pattern that you can figure out for yourselves however you wish.
If you increase crochet each row you get a hyperbola starting from 1 and ending with an exceedingly frilly edge. To make a cone, crochet one or more plain rows between each pattern row
(or knit, working Pattern backwards, decreasing instead of increasing).
To make "ripples", concentric circles with non frilly edge, you can go to the section with the maths on ripples etc, (see Back Index at right, April 17 2011 type 1), to decide how wide to make the interval rows between pattern rows. Circle circumference = 2 times Pi times radius. Good luck.
Here below is half section of a snailshell. It was soaked in a thin aquadhere glue liquid and then dried before cutting in half with a sharp scalpel. A real shell was halved with difficulty- the shell is incredibly strong- one has to bash it with a hammer.
The two sets of images following show the various configurations possible for a hyperbolic shape crocheted in yellow 8ply wool, I think it is, from memory, using a number 10 crochet hook and treble stitch.
(Usually I chose half treble.) This time the looser stitch makes it more comfortable to adjust into different directions.
The outside rows were of finer yarn- 987 row was in cream colour baby wool and the 1597 green row was crocheted in no. 8 crochet cotton. I wanted to try to make the apex of the shell a finer, tighter coil.
2, 7, 8, Open hyperbolic fan shape
4, "Stingray" shape, made by folding in half and the again in half several times.
5, "Chrysanthemun" shape,
1, Fold in half once, make clockwise spiral, just like a snail
9, Fold in half once, make anticlockwise spiral; this is not usually found in Nature.
3, 6, 16, Top and bottom views of most easily arranged shapes made by continuing spirals from corners.
11, 14, Two halves, front and back, one clockwise, one anticlockwise tight spirals.
10, Outside of proper "Bivalve" configuration
14, Inside of proper "Bivalve" configuration.
12, 15, "Whelk" snail shape, configured and padded.
17, :Snail" shape, padded.
18, "Nautilus" shape, padded.
Photo is of Pelagic snail 
A cold and sunny winter's day, one year ago.
Camera had self timer and I had to run back quickly before the shutter went off!
I was working on this 1597 crochet model.
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