The Manual of Conchology Volume 17, Scaphopoda: Structural and Systematic, written by George Washington Tryon Jr. in 1898, is a comprehensive guide to the study of Scaphopoda, a class of marine mollusks commonly known as tusk shells. The book provides detailed descriptions of the morphology, anatomy, and classification of these organisms, as well as their distribution and ecology. The first part of the book focuses on the structural features of Scaphopoda, including their shells, soft tissues, and reproductive systems. The second part of the book delves into the systematic classification of Scaphopoda, providing a detailed taxonomy of the various families, genera, and species within this class of organisms. Throughout the book, Tryon Jr. provides detailed illustrations and diagrams to aid in the identification and study of Scaphopoda. The Manual of Conchology Volume 17, Scaphopoda: Structural and Systematic, is an essential resource for researchers, students, and enthusiasts of marine biology and conchology.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.