Loft Function: Spiral Face to solid

#1

What might be the best way to merge the “open” circle to this solid face? Loft function doesn’t do this… or do we need to resize reposition???

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#2

Not sure I understand - what is "solid face"here?

#3

I’m trying to mimic the Bullata guerrinii Shell in a design.

Closing the ends is the issue I’m having…