FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 541 



which Hitchcock attributed to the liallux but its position is such that this seems highly 

 improbable. 



This is among the largest of the footprints and is so peculiar that one can see no 

 similarity to any other form. More material is needed before its true nature is deter- 

 mined. 



Type specimens, iios. ^J' and ',". counterparts, in the Hitchcock cabinet, from Mon- 

 tague, Massachusetts. 



Anticheiropus hamatus E. Ilitcheock. 

 Antieheiropux /lamatns E. Hitchcock, '65, p. I", pi. 'J, tig. \-2. 



Specific characters. Fes : divarication of digits H and HI, 20° to 40^ ; of HI and IV, 

 90° ; of II and IV, 100°. Length of digit II, .085 m.; of III, .110 m.; of IV. .050 to .060 

 m.; of the foot, .180 m. Distance between lateral tips, .200 m. Length of step, .400 m. 

 There are no distinct claws though the ends of the digits are pointed. 



This is certainly a questionable species. 



Type specimen, no. ~, of the Hitchcock cabinet, on red shale from Turner's Falls, 

 Massachusetts. 



(Tenus Hoplichnus E. Hitchcock. (Hoof track.) 



Hoplichnus K. Hitchcock, '48, p. 2oO. 



Generic characters. Quadrupedal; hind foot somewhat the largest; track hoof- 

 shaped. These tracks have no sign of digit or claw and are doubtfully referable to 

 vertebrates at all. 



Hoplichnus equus E. Hitchcock. 

 Hoplichnus equus E. Hitchcock, '58, p. lol, pi. 24, figs, o, 5. 



Hoplichnus quadrupedans E. Hitchcock. 



Hoplichnus quaclnipedans E. Hitchcock, '48, p. 230, pi. 16, fig. 7-8 ; pi. 22, fig. M. 

 Hoplichnus poledrus J]. Hitchcock, '58, p. 136, pi. 24, fig. 6-7 ; pi. 48, fig. 0. 



Both forms are from Massachusetts and the types are in the Hitchcock ichnological 

 cabinet, nos. — and ^, respectively. 



Genus Toxichnus E. Hitchcock. (Bow track.) 

 Toxichnus E. Hitchcock, '65, p. 12. 

 Generic characters. Quadrupedal, digitigrade, tetradactylous, leptodactylous. 



