Note 1553 — XIV THE INFLUENCE OF THE ENVIRONMENT AMONG ANIMALS AND PLANTS
Reading edition
Ibid., p. 215. Similarly the snail, Helix aspersa, has a variety (tenuis) with a thin shell which is found where calcareous material is scarce.
Reading edition
Ibid., p. 215. Similarly the snail, Helix aspersa, has a variety (tenuis) with a thin shell which is found where calcareous material is scarce.