R. 8. Lull — Carboniferous Footprints. 235 



and 4, about 85°. Length over all, 36 mm. Distance 

 between lateral toes, 35 mm. Breadth of palm, 18.5 mm. 



Pes (Fig. 1, p). — Pentadactyl, plantigrade, claws some- 

 what more acuminate than in manus, phalangeal pads 

 more or less distinct, phalangeal formula, omitting 

 metatarsals, apparently 2, 3, 4, ?4, 2 +, the outer digit 

 seemingly imperfectly impressed. Sole broadly rounded. 

 Divarication of lateral digits, about 93°. Distance be- 

 tween lateral digits, 80 mm. Length over all, 90 mm. 

 Breadth of sole, 45 mm. 



The disparity of size between manus and pes is very 

 marked, showing that the greater proportion of the weight 



Fig. 1. — Impression of the right manus(m) and left pes(p) of Dromoyus? 

 woodworthi, n. sp. One half nat. size. 



was borne by the latter. There is. no indication of, a 

 dragging tail. 



This footprint is most suggestive of Dromopus agilis 

 Marsh 3 from the Kansas Goal Measures, the chief dis- 

 tinctions being the greater size of pes and the non-corre- 

 spondence of phalangeal formula, which in Marsh's spe- 

 cies is the normal 2, 3, 4, 5, 2 of the diapsid reptile. The 

 apparent discrepancy may be due, however, to the obscur- 

 ity of the present track. The outer digit in the present 

 species is not so widely offset, but this again may be 

 more apparent than real. The foot of the new species is 

 somewhat more clumsy, and the digits are apparently 

 more deeply cleft into the sole. 



3 0. C. Marsh, this Journal (3), 48, 82, pi. 2, fig. 3; pi. 3, fig. 3, 1894. 



