Charles Darwin's Monograph of the Subfamily Cirripedia (Volume 1 of 2). The Family Lepadidae; or, The Stalked Clams, is a huge contribution to the study of the class Cirripedia. In this work, the author examines in detail the family Lepadidae, also known as stem borers. This book is the first volume of a two-volume edition and contains extensive scientific data on the biology, morphology and classification of this group of marine organisms. Darwin draws attention to the peculiarities of the structure and lifestyle of these crustaceans, which makes this book indispensable for scientists interested in biodiversity and the evolution of the marine world.