The land snail genera he researched included Poecilozonites and..
Achatinella
Helix
Cerion
Lymnaea
Answer
**Cerion** is a genus of small, air-breathing land snails, endemic to the Caribbean islands. They are found in a wide range of habitats, including forests, scrublands, and coastal areas. Cerion snails are known for their remarkable diversity, with over 600 described species, and are an important component of the Caribbean ecosystem, contributing to nutrient cycling and seed dispersal.
The Marvels of Stephen Jay Gould: A Quiz on the Life and Work of the Brilliant American Biologist and Historian of Science