The Nautilus. Volume XXXI, No. 2, October 1917: A quarterly journal devoted to the interests of conchologists. In each issue of "The Nautilus" magazine, the authors review the latest research in the field of molluscs and crustaceans. In Issue No. 2, published in October 1917, readers will find unique articles on various species of crustaceans, their ecology and behavior in nature. Famous scientists and conchologists share the results of their observations and discoveries, which makes this magazine an indispensable source of information for everyone interested in the world of marine fauna. "The Nautilus" not only reflects current scientific progress in the study of crustaceans, but also offers readers an exciting journey into the world of molluscs, revealing their enormous diversity and uniqueness. This volume is a valuable source of knowledge about marine biology and helps to expand our understanding of the complex nature of the deep ocean.