Vol. 68.] 



THE ' PERMIAN" ROCKS OF HAMSTEAD. 



669 



from Carboniferous rocks or from any other Permian areas. ~r'The 

 Hamstead specimen is rather less than half the size of the'^two 

 Grerman specimens described and figured by Prof. Pabst. With the 

 exception of this general difference in size, there is no distinction 

 between the two series of measurements of the British and German 

 examples, and the description given by Prof. Pabst of his I. hrachy- 

 dactylum answers to H3 practically in every particular. 



Type H^. Tchnitjm dolichodactylum Pabst. One specimen (a 

 cast). (See figs. 22 & 23, p. 668.) 

 The single specimen shows a connected track of small 

 footprints with feebly impressed ball, five long and out- 

 stretched toes on tbPe hind foot. Their tips are blunt. The fore 

 foot is overstepped by the hind foot, so that the fore footprint is 

 smaller and not so well preserved as the hind one. In no case are 

 more than four toes visible in the fore footprints. The toes are 

 straight, but do not taper regularly from the base as in H3. The 

 fifth toe diverges considerably from the line of track, whereas the 

 others point up the track in nearly parallel directions. The length 

 of the footprint is about equal to the width. 



31 easurements . 



H4. 



IcHjSIUM DOLICHODACTTLUar 



Pabst. Kothliegende. 



Fore foot: 



Length 



Breadth 



1st toe 



cms. 

 0-6 

 0-6 



0-3 

 0-3 

 0-4 

 0-3 



cms. 



1-3 



1-4 



0-5 



0-G 



0-8 



1-0 



0-6 



2ucl toe 



-ird toe 



4thtoe 



othtoe 



Hind foot: 



Length 



1-0 

 1-0 

 0-3 

 0-4 

 0-5 

 0-5 

 0-4 



i 1-9 



2-U 

 0-6 

 0-7 

 1-0 



ri 



0-8 



Breadth 



1st toe 



2ud toe 



3vd toe 



4th toe 



oth toe 





Track-measurement I 



Track-measurement 11 



Width of track 



0-4 

 1-6 

 1-8 



2-0 

 6-5 

 2-5 





Type H^ (fig. 22) is paralleled here with Ichnium dolichodactylum 

 (fig. 23). Prof. Pabst records his 1. dolichodactylum from the 

 Upper Kothliegende of Thuringia, from which only one specimen 

 was obtained. His description of it is as follows : — 



* Each footprint with feebly developed ball and five long, weak, straight, 

 outstretched toes, club swelling, but reducing again in size at the ends. No 

 claw. The first four toes narrowly grown together : the fifth toe separated from 

 them. The fourth toe is the longest, the first the shortest. The length of the 

 footprint greater than the width. The footprints of the fore foot shorter than 



