The thesis is organized as follows. Chapter 1 provides a description of the geological and paleoecological context in which the Nama specimens are found. This chapter also presents the tomographic and mathematical models of the Namacalathus morphology, as well as a systematic description. Chapter 2 presents the methods used to obtain tomographic reconstructions of individual fossils, and Chapter 3 contains a detailed discussion of how the mathematical model was developed. Appendix A contains a discussion of statistics regarding the types of fossils found in typical rocks, as well as their distribution in size, shape, and orientation. Appendix B contains a "database" of synthetic cross sections. Appendix C contains the documentation and source code for programs developed and used to obtain both kinds of models.