Summary: The Cambridge Natural History Volume VII, edited by S.F. Harmer and A.E. Shipley, addresses the publication delay while encompassing detailed information on the morphology of various invertebrate species, including fish taxonomy, teleosteans classification, and the study of ascidians among other themes. Notably, Professor Bridge acknowledges the collaborative input in reviewing and refining sections of the volume with experts like Dr. Traquair and Mr. Boulenger, showcasing the meticulous efforts invested in preparing the publication. This extensive zoological encyclopedia is recognized for its substantial information covering both familiar and obscure groups of animals. With comprehensive articles on diverse species, organs like the kidneys and reproductive systems, and systematic orders like Cyclostomata, the book is praised as a valuable resource for scientific inquiry appealing to both general readers and academic audiences, maintaining a high standard of scholarship and illustration quality throughout the book series.