[MATTHEW] NEW GENUS OF BATRACHIAN FOOTPRINTS 95 



that these footprints should be relatively what we have assumed them 

 to be. 



Barillopus arctus n. sp. PL III., figs. la-c. 



Stride, 12 mm. Straddle, 9 mm. 



The fore foot is placed under tlie hind foot or a little outside of 

 it, and the impression of the two feet are thus confused. 



Hind foot. Length 10 mm.; width 7mm. 4 toes, the outer rather 

 broad and blunt, the three inner slender, nearly parallel, directed some- 

 what outwai'd, bearing slender claws. Sole suboval, strongly impressed 

 in the middle, nearly as long as the toes. Angle of digits, I-IV^10° ; 

 I.-II.=0°. 



Fo7'e foot. Length, 5 mm. ; width, 5 mm. 3 toes, wide spread and 

 of nearly equal length. Sole, small, suboval. Angle of digits, II-IV=: 

 65°; n.-IIL=45°. 



This series of tracks consists of about twenty parts and is a mould 

 of soft grey sandy shale; the tracks approximate in going forward and 

 the straddle is thus narrowed. 



The mud layer on which these tracks are preserved has a very smooth 

 surface, but there is one below that is pitted with rain-drops, and one 

 above that has coarse:; depressions. 



This species differs from B. unguifer in the narrower impression, 

 and in the narrower, and weaker fifth digit; the three other digits are 

 proportionately longer and narrower than in that species, and the fore 

 foot is smaller. 



Barillopus confusus n. sp. PI. III., figs. 2a, h. 



Stride, about G mm. Straddle, 13 mm. 



The print of the foro foot has not been identified, but that of the 

 hind foot, owing to the short stride is set partly on the toe mark of the 

 antecedent impression of the fore foot. 



Hind foot. Length, 9 mm. ; with (when the fifth digit is extended), 

 8 mm. There are four toes of which the outer is widely spread from 

 the others ; the other three are sub-parallel and extend forward ; they 

 are weak and seemingly have no claws; the fourth digit is weaker than 

 the second and third, and the first is obsolete, or at least made no impres- 

 sion. Sole of this foot is suboval, strongly impressed; it is shorter 

 than the toes, and about one-third wider than long. Angle of the 

 digits, V.-IL=80°; V.-IV.=55°. 



Fore foot. The impression of this foot has not been distinguished. 



There is a sharp keel-mark along the middle of the track of this 

 animal, having a smooth space on each side of it, somewhat like Asperipes 



