Page:Parasaurolophus walkeri, a new genus and species of trachodont dinosaur.pdf/21

Rh 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.

It will be observed from the above table and from a glance at the ﬁgure that the sixth neural spine is unusually