XIII. 



PLESIOSAURUS. 



369 



and a length of i'75; the largest is 3*2 inches broad, and 2*15 

 long. In all the height is less than the breadth, the length being 

 proportionally greatest near the head. The articulating faces are 

 equally concave, more or less oval, neatly bordered; sides gently 

 depressed ; hsemapophyses bent down ; two large foramina beneath ; 

 zygapophyses divided in the middle ; the anterior pair deeply spoon- 

 shaped. 



Several dorsals are at present known from Shotover Hill, twelve 

 of them connected in a series ; there are also nine others detached 

 from Shotover and Foscombe, all found in Kimmeridge clay. Three 

 other dorsals found at Marcham appear to agree with them, and 

 may be regarded as posterior dorsals. 



Diagram CLXIX. Dorsal vertebra of Plesiosaurus brachyspondylus. 

 Scale one-fifth of nature. 



i. Seen in front. 



i. The posterior zygomatic process. 



In the series of twelve, the breadth is somewhat greater in the 

 forward vertebrae, the length somewhat greater in the hinder ones. 



In No. i. Length, 2*3 inches; breadth, 4*25; height to canal, 

 3-6. 



Bb 



