FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 525 



Type, no. ^, of the Hitchcock cabinet, on reddish shale from Turner's Falls, 

 Massachusetts. 



Steropoides loripes (K. llitclicock). 



Ornithopus loripes E. Hitchcock, '48. p. H'o. pi. 8, fig. 3. 



Tridentipes ins'ujnls E. Hitchcock, '58, p- •*!, pi. 15, fig. 4 ; pi. 45, fig. 3 ; pi. 47, fig. 2. 



Specific characters. Pes : divarication of digits I and H, 55° ; of II and III, 45° ; of 

 III and IV, 50° ; II and III, 95°. Length of digit I, .081 m.; of H, .109 m.; of III, .135 

 m.; of IV, .109 m. Distance between lateral tips, .160 m. Length of heel impression 

 varies np to .050 m. Length of foot, .152 to .178 m. Length of step, .400 to .567 m. 

 Width of trackway, .317 m. 



A long limbed, blunt clawed form ; subdigitigrade. 



Type specimens, nos. l- and ~, of the Hitchcock cabinet, on micaceous sandstone, 

 from near Montague, Massachusetts. 



Steropoides uncus (E. Hitchcock). 

 Tridentipes vnciis E. Hitchcock, '58, p. 91, pi. 15, fig. 5 ; pi. 46, fig. 1. 



Specific characters. Pes: divarication of digits I and II, 22°; of II and HI, 48°; of 

 HI and IV, 44°; of II and IV, 90°. Length of digit I, .028 m.; of II, .043 m.; of III, .056 

 m.; of IV, .036 m. Distance between lateral tips, .056 m. Length of heel, .028 m.; of 

 the foot, .082 m. Length of step, .215 to 227 m. Width of trackway, .155 m. 



*S'. uncus differs markedly from the other members of the genus in the short step and 

 wide trackway, and also in the position of the hallux wliich is only semirotated. 



The type is no. f, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



Genus Lagunculapes E. Hitchcock. (Flask foot.) 

 Lagunculapes E. Hitchcock, '58, p. 132. 



Generic characters. Bipedal, digitigrade, tetradactyl, with the clawless chgits widely 

 radiating and more or less flask- or club-shaped, dilating toward their tips; clawless. 

 There is but one species, L. latus E. Hitchcock. 



Lagunculapes latus E. Hitchcock. 

 Lagunculapes latus E. Hitchcock, '58, p- 132, pi. 24, fig. ] ; pi. 45, fig. 4. 

 Specific characters. Pes: divarication of digits I and II, 50°; of II and III, 70°; of 



