OXFORD CLAY. 
113 
yase. Shelf. Specimen. 
T f early caudal vertebrae, with concentric 
ridges of a somewhat cetacean aspect. The 
articulation for the rib is a groove which 
extends from the front to the back margin. 
These vertebrae steadily decrease in size. 
13—19 later caudal vertebrae with convex margins, 
rapidly diminishing in size. They recall the 
aspect of late caudal vertebrae among ceta¬ 
ceans, and are identical in form with the 
bones from the Cambridge Greensand which 
were supposed to belong to whales [Lyell, 
Sap. Elements , 1859]. The rib is last seen 
on f 15, the 81st vertebra of this series. 
20—30 These terminal caudal vertebrae are without 
ribs, and have the intervertebral surface only 
slightly impressed in the centre, are much 
elongated from back to front and compressed 
from side to side. They rather resemble the 
dorsal vertebrae of a Plesiosaurus than any 
other Ichthyosaurian bones, f 30, the 96th 
vertebra preserved, is about half an inch in 
diameter, and must have been nearly the 
last. 
II a 
a 
CABINET II. 
1 right coracoid, 'j Much expanded, so that to- 
2 left coracoid. J gether they measure nearly 
16 inches from side to side. The articulation 
for the scapula is unusually extended. The 
posterior emargination is deep, a 2 displays 
ribs on its under side. 
3 left scapula, | Unusually expanded at the 
4 right scapula. J humeral end, and unusually 
broad from side to side. a 4 shows ribs 
on its under side. 
5 left humerus, rather crushed at the proximal 
end; distal end expanded. 
8 
