https://en.wikipedia.org/wiki/Jeremy_(snail)
these two snails mated with each other instead, producing 170 right-coiled snails. One of the left-coiled snails later mated with Jeremy, producing 56 offspring, all of which also had right-coiling shells.
they also omitted this crucial detail:
Jeremy was named after the left-wing British Labour politician Jeremy Corbyn, on account of it being a "lefty" snail, but also due to Corbyn's reported love of gardening.