This is the fifth printing done in 2000. This part of the treatise deals with fossil oysters.
- Orientation and Axes
- Anatomy
- Physiology
- Ontogeny
- Shape, Form, and Size of Shell
- Terms, Chiefly Morphological, Applied to Oysters
- Distribution
- Phylogeny
- Classification
- Systematic Descriptions
- Families Doubtfully Related to Oysters
- Nomenclature Clarified