48 



it is perforated by the spinal canal, but both the oblique and spinous 

 processes of the neural arch are obsolete ; four rough tubercles at the 

 under part of the body indicate the attachment of the haemapophyses. 



279. The haemal arch and spine of a more posterior caudal vertebra ; the 



posterior articular surfaces are not developed on the base of either hae- 

 mapophysis, but are represented by rough tubercles. 



280. The body and neural arch of apparently the seventeenth caudal vertebra. 



281. A caudal vertebra from near the termination of the tail, apparently the 

 eighteenth : the spinal canal is a narrow open fissure ; the heemapo- 

 physial tubercles are very feebly developed at the anterior part of the body 

 of the vertebrae, and are lost posteriorly. 



282. The first rib of the right side. The vertebral portion is anchylosed to the 

 sternal portion, which is ossified : the vertebral end presents a single 

 oblong articular surface extending from the upper part of the head along 

 the short neck to the tubercle : the sternal end has a single subtriangular 

 articular surface for junction with the manubrium sterni. 



283. The corresponding rib of the left side. 



284. The second rib of the left side. The vertebral portion is anchylosed to 

 the ossified sternal portion ; the surface on the upper part of the head 

 and tubercle is divided into two by a rough tract above the neck, besides 

 which there is an articular surface at the extremity of the head which is, 

 as it were, truncated to form it. The articular extremity of the sternal 

 piece presents two distinct surfaces, separated by an intermediate rough 



285. Part of the vertebral portion with the anchylosed sternal portion of the 



second rib of the right side. 



286. The third rib of the right side. The vertebral portion is anchylosed to 



the ossified sternal portion : the vertebral end presents the terminal flat 

 surface upon the head, a convex surface above the head, and another 



