524 RICHARD SWAXN LULL ON 



This species is much smaller than the better known N. nKjensi, h\\{ very similar to it 

 in form. 



Type specimen, no. jf, of the Ilitchcook cabinet, is on red shale from Turner's Falls, 

 Massachusetts. 



Steropoides ingens E. Hitchcock. 



Steropoides ingens E. Hitchcock, '45b, p. 24. 

 Sillimanius adamsCtnus E. Hitchcock, '45b, p. 24. 

 Steropezoum ingens E. Hitchcock, '48, p- 182, pi. 5, fig. 1. 

 Ornithopus adamsamis E. Hitchcock, '48, p. Wl, pi. 7, fig. 5. 

 Tridentipes ingens E. Hitchcock, '58, p. 89, pi. 15, fig. 1. 



Specijic characters. Pes : divarication of digits I and H, 80° ; of II and HI, 50° ; of 

 III and IV, 58° ; of II and IV, 107°. Length of digit I, .127 m.; of II, .203 m.; of HI, 

 .242 m.; of IV, .145 m. Distance between lateral tips, .282 m. Length of heel impres- 

 sion, .230 m. Length of foot, .460 m.; of the step, 1.020 to 2.020 m. 



This is a large but very peculiar track as the metatarsal bones, the so called heel, 

 make a broad and deep impression shoaling out toward the rear as though that segment 

 of the leg were borne at a decided slant. The digits are long and very slender or else the 

 mud has slipped into the track as soon as the foot was withdrawn. There are no digital 

 pad impressions or other characters preserved. Tlie foot is more lacertilian than avian 

 and is totally unlike the typical dinosaurian tracks. Yet from its bipedal gait and the 

 number of digits, the maker of the impression must have been a dinosaur, though unlike 

 any form whose skeletal remains are known. 



The type specimen is no. j|, of the Hitchcock cabinet, on gray micaceous sandstone, 

 from Gill, Massachusetts. It is also found on the White hall. New Jersey, slab of red 

 shale, in the Rutgers college museum. 



Steropoides infelix Hay. 



Steropoides infelix 0. P. Hay, : 02, p. 552 (to replace elegantior a name already used 

 within the genus) . 



Tridentip)es elegantior E. Hitchcock, '58, p- "•'(), pi. 15, fig. 3; pi. 45, fig. 1 (not 

 Steropezoum elegantius, '46) . 



Specific characters. Pes: divarication of chgits I and II, 108°; of II and 111,32°; 

 of III and I\', 44°; of II and IV, 75°. Length of digit I, .010 m.; of II, .015 m.; of III, 

 .029 m.; of IV, .023 m. Distance between lateral tips, .028 m. Length of heel impres- 

 sion, .018 m.; of foot, .045 m. Length of step, .135 m. Width of trackway, .045 m. 



