50 
with some inflections: they are, as the plate repre- 
sents, very distinct. The shorter track appeared to 
me to be crossed by another; but the photographic 
impression, though only a few inches long, enabled 
me to ascertain that this appearance was produced by 
bird-tracks above and below. 
The bird-tracks are all tridactylous. The first set 
lies above and to the right of the shorter turtle-track, 
and is composed of only two steps, proceeding in the 
course of the plate downwards. The second set of 
bird-tracks has five impressions, extending from the 
right superior pointed angle of the slab across the 
small turtle-track to the larger, in which it is lost. 
The third set of bird-tracks begins by an impression 
larger than any other on the piece at the left extre- 
mity of the longer turtle-track ; and the remainder, 
three in number, descending towards the right, are 
the least distinct of any. The fourth set of bird-tracks 
begins below the longer turtle-track, and ascends by 
four impressions, crossing the track till it meets the 
first. 
The most curious track, consisting of six digitated 
impressions, still remains. The first is seen on the 
left of the longer turtle-track, near the largest bird- 
track; the second is on the track ; the third is above 
the track; the others cross the slab by fainter impres- 
