Before revision:   I detail a possible scenario involving actin/myosin layers in snails (and in  C. elegans ), and outline other mechanisms which might govern handedness in eukaryote cell motility and in plants .
After revision:  I detail a possible scenario involving actin/myosin layers in snails (and in C. elegans ), and outline other mechanisms which might govern handedness in eukaryote cell motility , and in non-flagellated bacteria .