[MATTHEW] NEW GENUS OF BATRACHIAN FOOTPRINTS 93 



and in the prints of the tips of the toes of the fore foot in species of 

 Asperipes. 



As in this latter genus, we must regard the foot which gives a three- 

 toed impression as the fore foot; otherwise the weight of the body must 

 have rested chiefly on the fore feet, which seems to be unnatural. 



CuESiPES Dawsoni n. sp. PI. I, Fig. 4. 



Stride 2^ (to 3) inches, 65 nmi. (to 75 mm.). Straddle, 2^ 

 inches (60 mm.). Fore foot pla.ced inside of the hind foot, smaller. 



Hind foot. Length, 16 mm.; width, 19 mm. There are five toes; 

 fifth toe much spread from the others; the four inner toes progressively 

 shorter inward; the third and fourth toes are directed somewhat out- 

 ward, the first and second forward or somewhat inward. The sole of 

 the foot is obscure, and about 7 mm. long and 13 mm. wide. No claws 

 are determinable. Angle of the digits, I-V=:110° to 135°; 1-11=50°. 



Fore foot 15 mm., width 12 mm. There are three toes; outer toe 

 spreading from the two others, which are less divergent from each other. 

 There is a spur from the back of the foot on the outside that may re- 

 present the fifth digit. The sole is obscure, perhaps 6 mm. long and 

 7 mm. wide. Fore foot as heavily impressed as the hind. Angle of 

 incidence of the digits, II-IV=4:0°-45° ; 11-111=35°. 



This series of footprints is impressed on a fine grained muddy 

 layer in fine grained gray sandstone with a somewhat undulated sur- 

 face, and pitted with worm burrows. The footmarks are in round 

 hollows made by the weight of the animal, and the mud has run in to 

 some degree into the footprints so as to narrow and obscure the im- 

 pressions of the toes. There is a good series of impressions of tlie feet 

 of the left side, but those of the right are broken away so that only a 

 toe each of three footmarks are left. 



This species is similar in type to Dî-oniopiis agitis Marsh, but there 

 are onl}'- three toes on the fore foot. It has perhaps a nearer relation 

 to the genus Asperipes, but although the number of toes on the fore 

 foot is the same, it lacks the long heel to the sole of the fore foot which 

 is found in that genus. It has a, general resemblance to Palœosauropus 

 primœvus Leidy, but that species is of more massive proportions and 

 the fore foot has four toes, while this species has three. 



CuKSiPES LEVIS n. sp. PI. IT, Fig. 3. 



Stride, 60 mm. Straddle, 27 mm. 



Very faint impressions of the fore foot are present; it is placed 

 behind and somewhat outside that of the hind foot. 



