OXFORD CLAY. 
117 
Case. Shelf. Specimen. 
HI b 2—14 cervical vertebrae, gradually elongating and 
enlarging as they pass backward. The 20th 
vertebra is 2 inches long, 3 inches deep and 
4^ inches wide. The intervertebral sur¬ 
face is slightly depressed, sometimes with a 
minute central pit. The tubercle for the 
rib is very large and elevated, and sub¬ 
divided into an upper and an under part 
from the third to the fifteenth vertebra. 
It gradually ascends the side of the ver¬ 
tebra till in the twentieth, which may be 
considered the first pectoral, it is partly on 
the neural arch. With the ascent of the 
tubercle the mesial ridge on the haemal side 
of the centrum disappears. 
Ill c 
c 
c 
1—16 vertebrae 21st to 35th are dorsal. 
1 may be considered pectoral, the rib being still 
partly supported on the centrum. 
2 measures 2^ inches from back to front. 
13 measures 2f inches from back to front; 3| 
inches high and 3f inches wide. The in¬ 
tervertebral surface is flattened, nearly cir¬ 
cular in outline, and hangs a little forward 
as in Kimeridge clay Pliosaurs. 
Ill d On this shelf are placed remains of the skull 
probably of a Pliosaurus from Lattenbury 
Hill near Huntingdon, presented by Arthur 
Sperling, Esq. 
There are four fragments from the region of 
the anterior nares, and showing the pre¬ 
maxillary and nasal bones. 
The principal fragment, 15 inches long, shows 
on the left side the sockets for 15 teeth. 
The sockets are as close as possible together 
without being confluent. Except in this 
character the remains correspond with Ich¬ 
thyosaur in the form of the face, &c. 
