and Clavicular Arch in Sauropterygia. 14B 



FlG. 10. — Shoulder girdle and interclavicle of Muranosaurv.s beloclis. Intc, Inter- 

 clavicle. Scapulae slightly distorted at their union with anterior processes 

 of the coracoids. 



10 inches. The anteroposterior measurement of the coracoids is 



11 inches in the median line, and that of the scapulae in the median 

 line is 3f inches. The scapulae are exceptionally slender, since the 

 least width from the concave lateral border to the foramen is 1-J inch. 

 The least transverse width of the coracoids in the middle of their 

 concave sides is 6J inches. The transverse measurement of the 

 scapulae behind the ascending process is inches. The ossification 

 between the anterior median margins of the scapulae is not complete, 

 and as they extend outward they are convexly rounded. 



The interclavicle was found in situ, resting on the visceral surface in 

 a depression between the anterior margins of the scapulae and not pro- 

 jecting in advance of those bones. It is lanceolate in contour, 2J inches 

 long, 1| inches wide towards the slightly concave anterior margin, and 

 half as wide at the rounded posterior extremity. It is a little distorted, 

 like the other bones of the shoulder girdle, has a flat visceral surface, 

 and an angular ventral surface, due to the bone being traversed by 

 an elevated median ridge, which dies away anteriorly, and from this 

 ridge the lateral surfaces are inclined. On the left side of the 

 ventral surface its middle part is covered by a thin film of bone, 

 which. I suppose may be part of the clavicle. It corresponds in texture 

 and thickness with a detached film of bone which rests upon the 

 right scapula. That ossification is triangular, about lj- inch in each 

 measurement, and has nearly straight sides. It is quite separate 

 from the interclavicle, and lies towards the external border of the 

 scapula ; there is no surface for its articulation, for all the margins of 

 the interclavicle are sharp, thin, and perfectly ossified, like its 



