ON THE FAUNA AND FLORA OF THE TRIAS OF THE BRITISH ISLES. 303 
irregular, and the length of the stride varied a good deal, and the figures 
given are only an approximate average. 
These prints, although rather larger, agree fairly well in form with 
the pes of E,! except that in E there is no trace of a V. digit, whereas on 
these the V. is strongly marked. With E there is almost always a small 
manus present on the inner side of the pes; no trace of a manus has 
been seen with these. The form seems very generally distributed, but it 
has been very difficult to find a series at all complete. 
It has some affinity with O from Hollington,” but there are differences 
which show it to be an entirely distinct form. 
The prints even in the same series vary a good deal in form, and at 
first sight might not be regarded as connected ; but a little careful ex- 
amination shows them to be the same foot. The differences are very 
generally caused by the straight or curved positions of the digits when 
put down. 
A print was described in the 1904 Report as F 2 from one fairly 
perfect print from Storeton, but it had not been seen in series. On the 
slabs now described there are several series of prints that appear closely 
allied to this, which will be distinguished as F 3. This form differs in 
having the claws less curved, and the protuberance at the base of the claw 
is less pronounced. The pes is, if anything, rather smaller than the 
manus, and the claw not quite so strong, and in both the digits are longer 
than in F 2. 
The prints of the pes and manus were frequently superimposed, giving 
rise to a long, narrow print with short digits. In one series nine of these 
followed each other without any separation of the prints being visible, but 
in another series they were found, as the track was followed, to separate 
into two clearly defined footprints. Closely associated with these, prints 
were noticed in which the digits terminated by circular discs : these had 
been also noticed on some prints at Runcorn ; there is little doubt these 
are caused by a movement of the claw, and not to any abnormal termina - 
tion to the digit. This is probably also the case with 
some of the Rhynchosauroid prints that show a thicken- 
ing of the end of the digit, and no visible claw. 
As there are certainly very marked differences in 
this print from any previously referred to, it is described 
as F 3. A broad print with the digits about half the 
total length of the print, five digits, the middle being 
the longest, each terminated by a powerful claw, less 
curved than F 2, and generally distinctly marked. ae ‘ some 
Manus. Length of print : . ae ay » 3D em. 
Length of middle digit : 5 ; ae 
Breadth of print ; ‘ 4 d 1 eget 
Distance from one print to another of same foot 20. 
Distance from right and left tracks about a Gg ae 
* Brit. Assoc, Rep., Cambridge, 1904. 2 Tbid., Part 1V., 1906, York. 
