FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 519 



genus Grallator. but the other characters are so obscure that it is difficult to assure one's 



self of their identity. 



Tj-pe, no. ^, of the Hitchcock cabinet, ou red shale, with shrinkage cracks, from the 

 Lily pond at Turner's Falls, Massachusetts. 



Argoides macrodactylotus (E. Hitchcock) . 



Platijpterna macrodactylotus E. Hitchcock, •45b, p. 25. 

 Argozoum disparidigitatum E. Hitchcock, '58, P- 82, pi. 14, fig. 2. 



Specific characters. Pes: divarication of digits II and III, 18° to 30°; of III and IV, 

 20° to 25°; of II and IV, 40° to 55°. Length of digit II, .076 m.; of III, .127 m.; of IV, 

 .01)0 ni. Length of foot, .140 m. Distance between lateral tips, .076 m. Length of step, 

 380 m. Width of trackway, .100 ni. 



Type, no. f^-, of the Hitchcock cabinet, from Weathersfield, Connecticut. 



Argoides redfieldianus E. Hitchcock. 



Argoides redjieldianas E. Hitchcock, '45b, p. 24. 



Argozouvi redfieldlanum E. Hitchcock, '58, p- 81, pi. 14, fig. 1. 



This track agrees in length and divarication of digits with that of Eubrordes 

 dimricatus and is undoubtedly synonymous with that species. The analysis of coproUtes 

 found associated with these tracks betrays the presence of uric acid which would place 

 the form unquestionably among the Sauropsida but not necessarily with the birds 

 (E. Hitchcock, '58, p. 43) . 



Argoides robustus E. Hitchcock. 



Argoides robustus E. Hitchcock, '45b, p- 24. 



Tliis form is not mentioned in any subsequent work^ and should therefore be 

 dropped from the list. What disposition was made of the specimens cannot be 

 determined. 



Genus Tarsoplectrus nom. no v. (Spurred tarsus.) 



Plectropus E. Hitchcock, '45b, p. 24 (in part) . 



Flectropterna ^. Hitchcock, '58, p. 108 (in part) for Plectropus, preoccupied. 



Generic characters. Bipedal, tetradactyl, plantigrade, heel narrow, tapering back- 

 ward, not always wholly hnpressing. Limbs long; trackway narrow. No phalangeal 

 pads nor distinct claws. 



