Two New Species of Fossil Footmarks. 53 
it, which I regard as very important. He at once exhib- 
ited to me a drawing of the foot of a recent Batrachian, the Aly- 
tis obstetricans, in a paper by Dr. Carl. Vogt, while the animal 
was in an embryo state. This drawing, which I have copied on 
fig. 3, shows the condition of the forefoot while yet ossification 
Fig. 3. 
