CAMBRIDGE UPPER GREENSAND. 
69 
Case. Coinp. Drawer. Specimen. 
J f iii 8—18 ternal surfaces are concave from front 
to back, and on the haemal angle round 
into each other from side to side. 16 is 
a late dorsal vertebra with the two 
tubercles almost confluent on each side 
and but little above the flattened ex¬ 
ternal haemal surface of the centrum. 
17, 18 are respectively early and mid- 
caudal vertebrae, and are attaining a 
more circular outline. 16 is largest in 
outline and longest from front to back 
of these vertebrae, 18 is shortest from 
front to back, but is larger in outline 
than 14 and 15. 
J f iii 19—44 Bones illustrative of the hand of Ichthyo¬ 
saurus; brick-shaped bones, and less re¬ 
gular bones from the borders. 
J f iii 45—55 Phalange bones, being those called ulna 
and radius and carpals. It is difficult 
to assign names to the bones seve¬ 
rally. 
J / iii 56—65 Teeth. 56 and 57 show the varying 
extent to which the sub-quadrate fang 
is absorbed by the external pulp which 
develops the new tooth. They also show 
the proper internal pulp cavity of the 
tooth filled with iron and crystals of 
lime. 62 shows the germ tooth in its 
pulp cavity matrix on the inner side of 
the fang. 63, 64 is a tooth split open 
to show the internal conical pulp cavity, 
which may be observed to be entirely 
closed at its base with osseous matter. 
65 is a fragment of a jaw with teeth 
in situ. That one with the number 65 
