XIII. 



PLEIOSAURUS. 



347 



An anterior dorsal, shorter and broader in proportion, measures 2*55 

 inches, 4*10, and 3*55. 



Or, if length = ioo, breadth = 146, height =131. 

 ioo, 161, 139. 



Eight vertebrae from Shotover, apparently belonging to this 

 species, have proportions as follows : Length, ioo ; breadth, 119 to 

 143 ; height, 109 to 136. 



A lumbar vertebra, quite perfect as to the body, the apophyses 

 absent, but their places of attachment very clearly marked, is from 

 Shotover Hill. The general figure and proportions agree with 

 the dorsals already noticed. The articulating faces are a little 

 concave, with small radiating undulations, and innumerable minute 



Diagram CXL. Pleiosaurus brachydeirus. Scale one-fifth of nature. 

 i. Lumbar vertebra, seen from above. -2. The same, seen on the left side. 



bordered open cells, or ends of vessels, like the fine hollow-celled 

 oolite of Bath. The sides are very finely striated lengthways ; there 

 are as many as eight foramina. The neural canal widens very much 

 behind. The neurapophysial cicatrix, nearly horizontal above, bends 

 down in a loop on the sides, and is deeply pitted. 



One anterior caudal vertebra has articular faces nearly circular, 



Diagram CXLI. Pleiosaurus brachydeirus. Scale one-fifth of nature. 

 Caudal vertebra, seen in front, on the left side, and from below. 



the front nearly plane, the hinder surface a little concave; lower 

 surface impressed on each side, with haemapophysial scars. 



