The Dinosaurs of Wyoming - Wyoming State Geological Survey ...

50 THE DINOSAURS OF vVYOMIl TG
The right ramus of the jaw of a three-horned dinosaur
preserved in Yale University Museum, collected in Wyoming,
exhibits a well-healed fracture. There is no callus (Figure 42)
but the jaw is deformed. The fracture may have been of the
green-stick type.
A broken and healed horn core of another three-horned
dinosaur (Figure 41) may be evidence of a fight.
An armor plate of a Stegosaurus, found in Wyoming shows
a row of abcsessed pits as if a carnivorous dinosaur had bitten
into the armor and the plate had become infected.
Diseases of the joints, called arthritides, are fairly common
among the dinosaurs, and are of different types. Perhaps the
FIGURE 11.
Drawing of a sawn hemisection of the large dinosaur tumor, shown in Figure 14.
The dark lines represent bars of bone and the white areas are blood spaces. The tumor
is an Haemangioma.
most interesting joint lesion is that of a tumor which has
united two caudal vertebrae into a solid mass (Figure 14).
The specimen was found in Wyoming in the Como Beds, more
than half a century ago. The tunlOr mass, after study, shows
all the characters of what medical men call an haemangioma.
a tumor filled with blood spaces tFiguTe 16). Its origin may
have been due to an injury to the tail, at a point far back from
the hips.
The tumor mass resembles closely the tumor-like growths
seen on live-oaks. Its mass has invaded the half of each vertebra
and entirely filled up the space between the bones. The
specimen has a length of 26.5 cm. and a weight of 5.1 kg. The
tumor itself is 12 em. long. Its surface is rather deeply pitted
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