"Marine Protozoa from Woods Hole. Bulletin of the United States Fisheries Commission 21:415-468, 1901" by Gary N. Calkins (Gary Nathan). In this scientific work, the author explores the world of marine protozoa, their structure, classification and role in the ecosystem of marine waters. The book contains a detailed analysis of the species and a description of their behavior, contributing to the understanding of the diversity and importance of these microorganisms to the marine environment. For lovers of marine biology and professionals in the field of marine science, this book will become an important source of knowledge and will help to deepen the understanding of the living nature of the underwater world.