670 MR. W. H. HARDAKER ON A FOSSIL-BEARING HORIZON [DeC. I912, 



those of the hind foot ;. gait alternating with partial overlap of the hind and 

 fore footprints.' 



Except that in the Hamstead forms of H^ the toe-tips appear to 

 be blunt, Prof. Pabst's description applies almost exactly to the 

 Hamstead specimen ; but the first toe is absent from the fore foot 

 of the Hamstead specimen, and the footprints are only about half 

 the size of those described by Prof. Pabst as his Ichnium dolicho- 

 dactyliim ; and the track-measurements I & II in H^ are also pro- 

 portionately smaller than in the German forms. 



Type H.. Ichnium gampsodacttlum ^^^hst = Sauriclinites lacer- 

 toides Geinitz. Eour specimens, A to D, ^n relief (casts). 



The footprints of this type possess a feebly developed baU 

 (sometimes not shown at all on the fossil), with u.ve long curved and 

 clawed toes, of which only four or even three are usually preserved. 

 One of the toes, the fifth, generally is widely separated from the 

 rest, and may be turned back in the track. The toe most often 

 absent from the impression is No. 1. The hind footprint sometimes 

 overlaps that of the fore foot, which is in consequence less easily 

 measurable, with regard both to the baU and to the toes. The fore 

 foot is the smaller. In its impression, the outstretched toe, the 

 fifth, is never indicated. The length of the footprint is distinctly 

 greater than the width. (See figs. 24 & 25, p. 671.) 









J^ba. 





Measurements. 



Ho. 



















Ichniu:m 



D. (Small 

 footprint.) 



Ichnium 







GAMPSODACTTLUM 



(average). 



GAMPSODACTTLUM 



(minimum). 



A. 



B. 



C. 



D. 



Fore foot: 



cm. 



cm. 



cm. 



cm. 



cms. 



cms. 



cms. cms. 



Length 















' 



Breadth 

















1st toe 















0-5 Oo 



2nd toe 











1"4 (may be absent) 



0-5 



0-7 0-8 



3rd toe 











2-0 



0-8 



ro ; 11 



4th toe 











3-0 



1-0 



1-5 To 



5th toe 





... 











0-7 



Hind foot: 















1 



Length 



5-0 



3-8 





5-0 



4-9 



1-8 



2-8 1 



Breadth 



4-0 



3-0 





3-0 



4-9 



1-7 



2-0 



1st toe 





0-7 







1*3 (may be absent) 



0-3 



0-5 



2nd toe 



1-5 



1-0 





1-0& 



' 1-9 



0-6 



0-8 0-6 



3rd toe 



37 



1-8 





1-5& 

 2-0 



3-0 



0-8 



1-0 1-0 



4th toe 



4-0 



2*2 





2-5& 

 3-0 



3-9 



1-3 



1-7 1-4 



othtoe 



3-0 



1-8 





3-0& 

 1-0 



21 





0-6 0-5 



Track-measurement I 



1 





1-5 



3o 



3-2 



1-5 



2-5 



Track-measurement I] 







4o 



40 



I'b 



4-5 



8-3 3-3 



Width of track 



... 





o'o 





7-2 



3-0 



5-0 4-0 



