494 



RICHARD SWANN LULL ON 



of II and 111,23''; of III 



Specific characters. Divarication of digits I and II. 118 

 and IV, 28°; of II and IV, 50°. Length of digit I, .026 ni.; of II, .077 ni. ; of III, .078 m.; 

 of IV, .083 ni. Length of foot, .128 m. Distance between lateral tips, .071 m. Length 

 of step, .153 ni. Width of trackway, .135 m. 



Type. no. \, of the Hitchcock ca])inet on micaceous shale from Turner'.s Falls, Massa- 

 clnisetts. 



Family GRALLATORIDAE. 



Family charactent. Small bipedal forms ; footprint tridactyl, limbs very long ; no 

 nianns nor caudal impression. Genus: Grallator; possibly also Stenonyx. 



Genus Grrallator E. Hitchcock. (One who goes on stilts.) 

 Grallator E. Hitchcock, '58, p. 72. 



Generic characters. Bipedal, tridactyl tracks ; tail trace absent (an apparent excep- 

 tion to this in a specimen referred to Grallator f/racilis) ; long limbs and small compact 



feet. Claws acuminate, moderately developed. 



This genus is distinguished from Anchisauripus, which it 

 most closely resembles, by the length of limb, smallness of 

 track and the absence of a hallux. It suggests in proportions 

 the Cretaceous genus, Ornithomimus, and is about the only 

 group of pachydactylous tracks which could possibly be 

 referred to birds, some species suggesting the bustards though 

 iu the latter group the pads on digit IV are specialized by 

 coalescence and all seem to be arthral as opposed to the 

 mesarthral pads of Grallator. The association of the long 

 limbed Grallator with the amphibious Otozoum suggests pos- 

 sible wading habits on the part of the former. 



Type species, Grallator rinsorius E. Hitchcock. 



Grallator cursorius E. Hitchcock. 



Fig. 12. Grallator cursorius E. 

 Hitchcock. Impression of the left 

 pes. X f. With a restoration of the 

 skeleton. Drawn from no. | of the 

 Hitchcock cabinet. 



Grallator cursorius E. Hitchcock, '58. p- 72*. pi. 13, fig. 3; 

 pi. 58, fig. 4. 



Specific characters. Divarication of digits II and HI, 14° ; 

 of ill and IV, 12°; of 11 and IW 26°. Length of digit II. .035 



