268 



THE BATH OOLITE PERIOD. 



CHAP. 



came to be observed; and when all the spoils collected by the 

 workmen came to be studied, several specimens of importance were 

 added ; viz. a pair of ulnae of the great animal, and one humerus 

 of the small individual. 



Sternum. A broad, slightly-undulated plate, of transversely- 

 elliptical contour, emarginate in front, running out into processes 

 behind, with lateral facettes for the apposition of the coracoids, 



Diagram XCVIII. Sternum of Ceteosaurus. Scale one-tenth of nature. 



Sternum of ceteosaurus (s.); in relation to the coracoids (c. c.) ; as one of these is 

 to the scapula (sc.), and humerus (&.). The sternal rib-junctions are marked r. 

 The drawing is made from separate specimens of the bones, the allocation being a 

 matter of inference. It is supposed that the bones are seen by looking down (or 

 internally) on the sternum ; the coracoid in the same plane as the sternum, to give 

 its shape, and not inclined, as it was in the body. It is supposed that the middle 

 retral prominence of the sternum carried a divided rib, as in monitors. 



furnishes the central support for the shoulder-girdle of ceteosaurus. 

 In Diagram XCVIII. the bone is seen internally, 19 inches broad (if 

 complete), 15 long, and aj- thick at the coracoid junctions. These 

 junction surfaces are inclined 45 to the plane of the bone ; those 

 of the coracoids about 75 : from which it follows that the bones 

 must have been inclined to each other 1 20 ; and the general 



