3) 
there are four toes_in the fore feet, and five in the 
hind ; but, in the specimen before us, the front toes are 
five in number, and the back toes three. It is called, 
therefore, ANomapus, wnequal-footed. These impres- 
sions are in the red shale of Hadley, and very distinct. 
In some of them the lower leg is indicated, forming 
an impression six or seven inches long. The feet be- 
ing smaller than the legs, the impression made by the 
latter is more expanded, superficial, and broader, yet 
still very definite. The opinion of President Hitch- 
cock and Dr. Deane is, that the different impressions 
of five and three toes are those of the anterior and 
posterior extremities of one animal, which, from the 
size of the limbs, might be a frog three feet high. 
On the same schist with these footmarks, are other 
curious impressions. ‘The back of the slab is almost 
covered with the imprints of rain-drops. In the midst 
of these is a tridactylous impression, probably of a 
quadruped, crossed at its root by a single depression, 
nearly an inch broad, and two and a half long: this 
seems to form part of another broad superficial im- 
pression of about seven by four inches, which is 
probably also quadrupedal. Other parts present the 
impressions of nails and worm-tracks. At the oppo- 
site end is a deep, smooth, regular excavation, which 
might have been made by a Medusa. 
