48 
EXTINCT MONSTERS 
that on some slabs may be seen what is believed to be the i 
impression of the tail of a Dinosaur as it dragged along over j 
the moist sand of the seashore or estuary where these antediluvian 
creatures of old disported themselves (see Fig. 5). ' 
Those impressions which Hitchcock believed to have been I 
made by birds show a regular increase in the number of joints | 
Fig. 5. — Footprints from the Connecticut Sandstone. The three tracks in the ! 
middle show the mark left by the tail, probably of a Dinosaur (After Hitchcock.) j 
of the toes ; the inner toe having two, the middle one three, 
and the outer one four joints. Now, it happens, by a remark- | 
able coincidence, that in the case of birds the inner toes have jj; 
the last two joints in each case make but one division of thep; 
track, so that their tracks correspond with those we are con-W^i 
sidering. The discovery that some Dinosaurs have but three 
