. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. GIRDLES AND LIMBS OF THE PRISTEROGNATHID THEROGEPHALIA 127 The girdle consists of two sets of bones—replacement and dermal bones. The replacement bones, forming the so-called scapular girdle, form a scapulo- coracoid composed of a dorsal plain blade-like scapula, lying practically vertically but curving slightly round the thorax, and a ventral antero-posteriorly elongated coracoidal plate, composed of a large precoracoid and a smaller posterior coracoid, curving gently inwards towards the middle line. The pair of scap
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. GIRDLES AND LIMBS OF THE PRISTEROGNATHID THEROGEPHALIA 127 The girdle consists of two sets of bones—replacement and dermal bones. The replacement bones, forming the so-called scapular girdle, form a scapulo- coracoid composed of a dorsal plain blade-like scapula, lying practically vertically but curving slightly round the thorax, and a ventral antero-posteriorly elongated coracoidal plate, composed of a large precoracoid and a smaller posterior coracoid, curving gently inwards towards the middle line. The pair of scapulo-coracoids are held in position relative to each other by their connexion. Fig. 2. Diagrams of the pristerognathid pectoral girdle drawn from a model based on a number of specimens, a, lateral, b, anterior, c, ventral. CO —coracoid (posterior). CL —clavicle. CM—cleithrum. g—glenoid. ICL—interclavicle. PCO — precoracoid (anterior). SC —scapula, scf—foramen supracoracoideus. tr—origin of the scapular head of the m. triceps (in ^innosaurus the origin is from a distinct tubercle). with the clavicular girdle of dermal bones consisting of an unpaired medially disposed interclavicle and a pair of bracing clavicles. Ventrally the coracoidal plate rests on the upper face of the interclavicle. Ventrally the spatulate end of each clavicle curves below around the anterior end of the interclavicle to fit into an oval hollow on the under face of this bone. Dorsally the stem of the clavicle sweeps upwards externally of the anterior end of the precoracoid and the lower part of the scapula and is then applied to the anterior edge of the scapular blade. Here it meets the cleithrum which is in all probability a splint- like bone applied to the upper anterior scapular edge. On the posterior border of the scapulo-coracoid, at the junction of the scapular and the coracoid, lies the simple, antero-posteriorly shortened, glenoid. Please note that these images are extracted from
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Keywords: ., bookauthorsouthafr, bookcentury1800, bookdecade1890, bookyear1898
