This work investigates the taxonomy, identification, and historical distribution of non-marine gastropods across Great Britain and Ireland. Arthur Erskine Ellis, a recognized authority on malacology, synthesizes decades of field observation and fossil record analysis to provide a comprehensive reference for the identification of land and freshwater snails. The text establishes a rigorous framework for distinguishing species based on morphological characteristics and geological provenance.

Experts and naturalists regard this volume as a foundational reference for the study of British mollusks. Readers frequently note the technical precision of the descriptions and the utility of the historical data for tracking environmental changes over geological time.