CAMBRIDGE UPPER GREENSAND. 
45 
CABINET XCY. 
POLYPTYCHODON. 
Case. Shelf. Spm. Tablet. 
95 a 1—8 1 reputed atlas and axis; 2—4 cervical 
vertebrae; 5 larger cervical; 6—8 frag¬ 
ments of ribs. 
b 
1—49 
1—49 teeth of Polyptychodon. 
c 
1—14 
50—63 teeth of Polyptychodon. 
d 
1—40 
64—103 teeth of Polyptychodon. 
Associated 
Series of Polyptychodon. 
e 
1—5 
1 atlas and axis; 2—5 cervical vertebrae. 
/ 
1—5 
6 cervical; 7—10 dorsal. 
9 
1—5 
11—15 dorsal vertebrae. 
Macrurosaurus. 
89 
i 
1—4 
caudal vertebrae. 
90 
h 
1—4 
caudal vertebrae. 
91 
h 
1—4 
caudal vertebrae. 
92 
h 
1—4 
caudal vertebrae. 
93 
h 
1—5 
caudal vertebrae. 
94 
h 
1—6 
caudal vertebrae. 
95 
h 
1—11 
caudal vertebrae. 
The first 23 vertebrae of this series were found on Coldham 
Common. The small part of the tail is from Barton, and was 
presented by the Bev. W. Shaw. It may be part of the same 
individual. The last three vertebrae are part of another indivi¬ 
dual : one vertebra is biconcave, and appears to indicate the begin¬ 
ning of the biconcave part of the tail. 
The early caudal vertebrae are procaelous, with the cup and ball 
well developed; the sides of the centrum approximate interiorly 
to a rounded ridge, and they give off strong transverse processes 
below the neural arch. The transverse processes soon disappear, 
and the centrum is rounded and smooth like a dice-box. There 
are no chevron bones. The centrum of the earliest caudal ver¬ 
tebra preserved measures in length inches. 
