TEICLEIDUS SEELETI. 159 



to have a fibrous structure. The clavicles [cl.) are elongated bones, consisting of a 

 thickened central axis which at their median ends widens out and bears, both on its 

 anterior and posterior margins, thin expansions which fit against the visceral face of 

 the anterior part of the interclavicle. The outer ends of the clavicles are not well 

 preserved, but probably they terminated in points resting against the anterior borders 

 of the scapulae as in Crypt ocleidus ; the inner ends of the clavicles do not seem to have 

 met in the middle line. From the above account it will be seen that in this genus the 

 clavicular arch is in many respects intermediate in structure between that of Crypto- 

 cleidus and of Murcenosauriis. 



The general form of the scapula will be best understood from the figure (text- 

 fig. 76, sc). The ventral bar is large, though not so much expanded as in some species of 

 Murcenosaurus, e. g. M. platycUs. The symphysis is thickened posteriorly, but thins 

 out towards the front, terminating in a point beyond which the median borders of the 

 thin anterior portions diverge from one another, leaving a V-shaped notch. This is 

 concealed above by the overlying interclavicle, which rests in the depression formed by 

 this thin anterior portion of the scapulae. The anterior edges of the dorsal rami are 

 continued on to the visceral face of the ventral rami as ridges, against the front of 

 which the clavicles seem to have fitted ; and a roughened surface on the anterior edge 

 of the dorsal ramus near its lower end probably marks the point of attachment of the 

 outer end of the clavicle. Above this surface the anterior edge of the dorsal ramus 

 becomes thin and sharp; the whole is directed strorgly backwards. The posterior 

 (articular) arm of the scapula is closely similar to the same part of the Mureenosaur 

 scapula. 



'ihe general form of the coracoid is shown in text-fig. 76. The bone, as a whole, is 

 very thin, especially in its posterior median portion. Anteriorly, on a line connecting 

 the two glenoid cavities of the conjoined bones, there is a great thickening, especially 

 towards the middle line, where the inner surface of the thickened portion bears the 

 roughened syraphysial facet for the union of the two sides ; this symphysis is continued 

 forwards between the median prolongations of the coracoids and becomes continuous 

 in front with the scapular symphysis; the thin posterior portions of the coracoids 

 also unite in the middle line for a considerable distance. The visceral surface of this 

 region of the coracoids is deeply concave. The prominent postero-Iateral processes 

 terminate in a slightly concave surface, showing that in life they were tipped with 

 cartilage. The surface for articulation with the scapula is triangular in form and is 

 covered with rugosities: the glenoid surface is three-quarters af an oval; it is nearly 

 smooth, showing that ossification was complete, as it is found to be in other parts of 

 this skeleton. The anterior prolongations of the coracoids for median union witli the 

 scapulee are not quite symmetrical, that on the right side being rather longer tiian the' 

 other; in the shoulder-girdle of the type specimen oi Murxnosaurus platyclisl\\eiiiim.t 

 peculiarity is noticeable. 



