IMPRESSIONS OF THE PAST 39 
called Anomepus, with their accompanying 
short fore feet, mark where some Dinosaur 
squatted down to rest or progressed slowly on 
all-fours, as does the kangaroo when feeding 
quietly ;* and we interpret the curious heart- 
shaped depression sometimes seen back of the 
feet, not as the mark of a stubby tail, but as 
made by the ends of the slender pubes, bones 
that help form the hip-joints. Then, too, the 
mark of the inner, or short first, toe, is often 
very evident, although it was a long time be- 
fore the bones of this toe were actually found, 
and many of the Dinosaurs now known to 
have four toes were supposed to have but 
three. 
It seems strange, and it is strange, that 
while so many hundreds of tracks should have 
been found in the limited area exposed to view, 
so few bones have been found — our knowledge 
of the veritable animals that made the tracks 
* Tt is to be noted that a leaping kangaroo touches the 
ground neither mith his heel nor his tail, but that between 
jumps he rests momentarily on his toes only; hence impres- 
sions made by any creature that gumped like a kangaroo would 
be very short. 
