8 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



tendency as age increases for two or more of these pads 

 to coalesce. That at the base of the curved digit is larger 

 than the rest, and serves to form the hinder and outer 

 margin of the foot. On the other side there is generally 

 no impression at all in the rear of the pads of the other 

 digits. The function of the curved digit is not clear. 

 That it was opposable is extremely doubtful ; it is always 

 found in the position shown in the specimens before you 

 (Fig. 1, plate II.), and probably merely took some small 

 share in the support of the body. In front of this hind 

 foot, as we may suppose it to be, at a distance of a few 

 inches, and in the same line, is usually found the print of 

 a much smaller foot, which we may safely take to be the 

 fore foot. It has five short, stout, tapering and rather 

 widely divergent digits, the one corresponding with the 

 curved digit of the hind foot being most divergent, in 

 some cases pointing rather backwards than forwards. 

 There are hardly any traces of divisions of the phalanges, 

 nor are there of terminal claws. The footprint is rather 

 broader than long, and is general^ somewhat less than 

 half the length of the hind foot. 



The print of the fore foot is generally less distinctly 

 marked than that of the hind foot. If we take a series of 

 feet, they are found to be all nearly in a straight line ; the 

 axes of the right and left tracks are not more than about 

 3in. apart, often much less, whilst the stride, measured 

 from the tip of the toes on one foot to those of the next 

 impression of the same foot, is between 3ft. 6in. and 4ft. 

 The soles of both hind and fore feet were covered with 

 small protuberances. This appearance was first described 

 by Professor W. C. Williamson as being observed on a 

 footprint from Daresbury, Cheshire,* and he points out 



* Quart. Jl. Geol. Socy., vol. xxiii., p. 56. 1867. 



