XIII. 



PLESIOSAURUS. 



373 



The largest is 4*00 inches in breadth, 3-30 high, and 2*55 long. 

 On an average of all the specimens, the proportions are length 

 = 100, breadth = 158, height = 130. 



PLESIOSAURUS PLICATUS. PW. 



Specimens belonging to two distinct but allied species appear 

 under this name in the Oxford Museum. Of the first, the cervical 

 and beginning of the dorsal region are well illustrated in a con- 

 tinuous series of eight vertebrae from Shotover. The cervical 

 vertebrae, confining this term to such as have the rib process 

 supported on the body, and quite separate from the neurapophysis, 

 are, in all, eight in number, five of which belonged to the same 

 individual, and are consecutive. Their places may be (probably) 

 marked as 15, 1619-22, 23, 24, 25, 26, 27, 28 ; then follows next 

 in order a vertebra of a somewhat different figure, which may better 

 be called anterior dorsal : only the last three had the diapophyses 

 ossified to the body. 



Taken in order from the head, the I5th has a length of 2*5 

 inches, a breadth of 2' 8, and a height of 2*1, measured on the 

 anterior face to the canal, which is broad, biforaminated, and 

 somewhat excavated in the middle ; in the 25th the measures 

 are length, 2*85 inches; breadth, 3-8; height, 2*7: and in the 

 anterior dorsal the length is 2*90, breadth 3*45, height 2'8. 



2 3 



Diagram CLXXIII. Plesiosaurus plicatus. 

 i. Seen on the left side. 2. Seen beneath." 3. Seen above. 



Thus viewed as to proportions, the I5th has length 100, 

 breadth 112, height 84; the 28th has length 100, breadth 133, 



