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Parasaurolophus Walkeri
17
postzygopophysis is only 50 mm. and the 16th is quite small.
The diapophyses are prominent, long, and somewhat variable in shape: measurements are given in the table below.
The ribs are very heavy when compared with those of such genera as Corythosaurus or Kritosaurus. The fourth, fifth, and sixth ribs show distinct evidence of injury during the life of the animal. There is a distinct fracture observable in the fourth, and the fifth and sixth show swollen coalescences of broken parts.
MEASUREMENTS OF CERTAIN ELEMENTS OF THE DORSAL REGION
Dorsal |
Neural spine |
Diapophysis |
Rib | ||
|---|---|---|---|---|---|
| Length | Width at |
Length | Width | ||
| 1 | 160 | 130 (?)
|
360 | ||
| 2 | 165 | 120 from
|
590 | ||
| 3 | 170 | 120 centrum
|
840 | ||
| 4 | – | 135
|
970 | ||
| 5 | 180 | 135
|
1050 | ||
| 6 | 140 | 120
|
1130 | ||
| 7 | 140 | 110
|
1140 | ||
| 8 | 295 | 55 | 95
|
125 | 1115 |
| 9 | 290 | 85 | 100
|
100 | 918 |
| 10 | 305 | 85 | 95from
|
80 | 685 |
| 11 | 305 | 85 | 100 base of
|
400+ | |
| 12 | 300 | 100 | 110 neural
|
280+ | |
| 13 | 285 | 95 | 120spine
|
275 | |
| 14 | 270 | 80 | 150
|
245 | |
| 15 | 275 | 75 | 120
|
198 | |
| 16 | 280 | 80 | 120
|
105 | |
| 17 | – | – | 180 (?)
|
present but indeterminable | |
It will be observed from the above table and from a glance at the figure that the sixth neural spine is unusually
