The heraldry section features snails on coat of arms, many of them from municipalities, but some of noble families.
André Le Nôtre (1613–1700) was born as the son of the head gardener of Palais des Tuilleries during the reign of French King Louis XIII. Later he served as principal gardener for his successor Louis XIV, and one of his works was the design of the park of Palais de Versailles. 
When he was ennobled by the King in 1681, he choose as design for his coat of arms a large headed cabbage and three silver snails on a green background with a chevron in gold. [2, 3, 4]
The silver snails are directed to the right, their heads up, with two long tentacles, and the shells are stylised.
Interestingly, I found another picture for this coat of arms , which looks more authentically to me. The cabbage is larger, the snail heads are directed away from the viewer, have also the smaller lower tentacles, and spiral bands in the colour pattern. Moreover, the upper left snail is mirrored. I would say they were designed after Cepaea sp. They are drawn according to reality, as one would expect from someone spending much of his time in gardens.
 http://www.lenotre.culture.gouv.fr/en/tps/index.htm (10.i.2014).
 http://www.lenotre.culture.gouv.fr/en/ln/fi/car03.htm (10.i.2014).
 One source has the following story on the coat of arms: “The king was very fond of Le Notre and once offered him a coat of arms. Le Notre responded, ‘I’ve got one already, three slugs crowned with cabbage leaves.’ ” (http://splendors-versailles.org/TeachersGuide/Building/ – 10.i.2014). Another version is “One day, conversing with his master gardener, the king said, ‘I would like to ennoble you. What do you want for a coat of arms?’ The simple country man, more interested in the opening up of a bud than in worldly honours, laughingly replied, ‘Sire, three snails topped by a cabbage stalk would be enough for me.’ ” (http://bit.ly/1dBAftF – 10.i.2014).