314 



THE OXFORD OOLITE PERIOD. 



CHAP. 



foramina. The neural canal is striated lengthways on the floor, 

 and in some vertebrae two foramina are observed. The smallest 

 of these vertebrae are more concave on the faces than the larger. 



Length of the smallest, 1*5 inches; breadth, i'6o; height to 

 the canal, 1*30. The dimensions in the largest are, length, 3-10; 

 breadth, 3-65 ; height, 2*00. 



There are two anterior dorsals, incomplete only by loss of the 

 neural spines. 



Two foramina appear in the middle of the neural canal, and other 

 two, as usual, on the lower face. The interval between these grows 

 larger as we pass along the column, and they become lateral in 

 the middle dorsals. Length, y% inches ; breadth, 3-05 ; height, 

 yz to the canal. 



Two middle dorsals accompany the other vertebrae, incomplete 

 in neurapophyses. These are longer than the anterior ^dorsals in 

 proportion to the diameters ; they have the same slightly concave 

 articulating faces ; the sides are impressed below the diapophyses, 

 and in each depression is a foramen. Length, ^4 inches ; breadth, 

 2-8 j height, 3-4. 



PEOPOETIONATE MEASUEES OF THE VEETEBE^E OF PLESIO- 

 SAUEUS AND STENEOSAUEUS IN THE OXFOED CLAY. 



