Crinoids are the most primitive living members of the Phylum Echinodermata. Though still present in reduced numbers today, crinoids were the dominant echinoderms from the Ordovician to the Permian. The crinoid body plan consists of three major regions, the column, the calyx, and the arms. Each region serves important functions in crinoids. The column raises the rest of the body into the water column for more efficient feeding. The calyx contains the visceral mass and mouth. Arms extend out from the top of the calyx to trap microorgansisms and suspended organic particles in the water column. A re-evaluation of these functional units is undertaken to understand the importance of various structures and to obtain discrete characters for use in a cladistic analysis. The relationship of crinoid crown groups has been an active area of research for the past couple of decades. With each proposed phylogenetic relationship, a new interpretation of thecal plate homology has been proposed. Here each study is re-examined in the light of new data. A review of functional morphology indicates a dual-reference system to be the most supported interpretation of plate homology. The two reference points in this system are the stem-cup and the cup-arm junctions, at the top and bottom of the calyx. The difference between a two-circlet and three-circlet crinoid is the presence or absence of the middle (basal) circlet. A new cladistic analysis is presented, with the topology of trees obtained giving support for the retention of Paleozoic crinoid stem and crown groups. Crinoids appear abruptly in the fossil record. Questions pertaining to origins and ancestral stock abound. A biogeography study is employed to look at the distribution of crinoids from the Early to Middle Ordovician. Locality information, combined with an understanding of the movement of major plates, paleoclimate data, an understanding of larval distribution, and a review of similar studies carried out on different taxa, gives insight into possible radiation and dispersal patterns of crinoids from the first half of the Ordovician. / text

Text in English / Ancient Egyptian distinctive headdresses made from precious or semi-precious materials date to prehistoric times, indicating a growing sense of individuality and hierarchy. Women’s headdresses were indicators of rulership, divinity, social status, cultic affiliation and wealth. Visual evidence indicates that female identity was emphasised by external and outward appearance and headdresses in the form of diadems followed recognised stylistic dictates throughout the Dynastic Period. The floral and faunal motifs used in the embellishment were believed to have protective amuletic and magical powers. Although a considerable amount of investigation has been undertaken into the use of materials and techniques used in the manufacture of diadems, the incorporation of symbolism and iconography of these gendered artefacts as a means of interpreting visual messages and self-expression has largely been unexplored. The study has been limited to well-provenanced, extant Old, Middle and New Kingdom diadems housed in various museums worldwide. / Old Testament and Ancient Near Eastern Studies / M.A. (Ancient Near Eastern Studies)