FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 



533 



Specific characters. Pes: divarication of digits I and II, 20° ; of II and III, 30° ; of 

 ill and IV, 40° ; of I and IV, 90°. Lengtli of digit I, .013 m.; of II, .015 m.; of III, .027 

 m.; of IV, .015 m. Distance between lateral tips, .030 m. Length of heel, .043 m.; of 

 foot, .069 'm. Breadth of heel, .012 m. Length of step, .084 to .178 m. Width of track- 

 way, .076 m. 



Manus : with five digits radiating through about 180°. Length, .023 m.; breadth, 



.018 m. 



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



Massachusetts. 



Palamopus gracilipes (E. Hitchcock). 

 Macropterna gracilipes E. Hitchcock, '58, p. 129, pi. 13, fig. 6 ; pi. 34, fig. 1. 



Specific characters. Pes: divarication of digits I and II, 40° ; of II and III, 25° ; of 

 III and IV, 25° ; of I and IV, 90°. Length of digit I, .004 m.; of II, .007 m.; of HI, .008 

 m.; of IV, .007 m.; of heel, .007 m.; of foot, .015 m. Length of step, .060 to .070 m. 

 Width of trackway, .080 m. 



Manus: but four digits impressing; form and divarications about that of the pes. 



Length, .005 m.; breadth, .009 m. 



Type specimen, no. H, of the Hitchcock cabinet, on shale from Turner's Falls, Massa- 

 chusetts. 



Palamopus rogersianus (E. Hitchcock). 



Sillimanuis rogersianus E. Hitchcock, '45b, p. 24. 

 Macropterna rhynchosauroidea E. Hitchcock, '48, p- 233, pi. 15, fig. 9. 

 Macropterna vulgaris E. Hitchcock, '58, p. 128, pi. 23, fig. 5 ; pi. 35, fig. 9 ; pi. 37, 

 fig. 4 ; pi. 48, fig. 7 ; pi. 49, fig. 3 ; pi. 59, fig. 5. 



Specific characters. Pes : divarication of digits I and II, 30° ; of II and III, 20° ; of 

 HI and IV, 30° ; of I and IV, 80°. Length of digit I, .005 m.; of II, .009 m.; of HI, .013 

 m.; of IV, .013 m.; of the heel, .015 m.; of the foot, .028 m. Length of step, .046 m. 

 Width of trackway, .050 m. 



Manus: five digits impressing, ranging through 180°. Length, .015 m.; breadth, 



.011 m. 



Caudal trace sinuous, not always present. 



Type specimens, nos. |f and ||, of the Hitchcock cabinet, from Turner's Falls, Massa- 

 chusetts. 



