FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 531 



Helcura littoralis H Hitchcock. 



HeAmra Httoralis E. Hitchcock, '48, p. 244, pi. 15, fig. 1 ; pi. 23, fig. 3. 

 Ileloira caudata E. Hitchcock, '58, p. 140, pi. 37, fig. 3 ; pi. 40, fig. 1. 



Specific characfers. Length of stride, .150 ni. Width of trackway, .125 m. 



Type specimen, no. f^, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



Helcura surgens E. Hitchcock. 

 Helcura surgens E. Hitchcock, '58, p- 141, pi. 36, fig. 10. 



Siiccific characters. Width of trackway, .125 to .150 m. No caudal trace. 

 This species is distinguished from the others by its greater width of body and the 

 absence of a tail trace and of footprints. 



Type specimen, no. f, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



INCER 1\ 1 E SEDIS. 



Forms habitually quadrupedal. 



Genus Eupalamopus Hay. 



Eupahimopus 0. P. Hay, :02, p. 544 (name given as a substitute for Palamopus E. 

 Hitchcock, '48, p. 217, preoccupied by E. Hitchcock iu 1845). 



Generic characters. ? Quadrupedal. Pes palmated, tetradactylous, all toes directed 

 forward. Heel stout, bent outward. Mauus not well known, about one third the length 

 of the pes. 



Eupalamopus dananus (E. Hitchcock). 



Pcdamojms dananus E. Hitchcock, '48, p. 217, pi. 9, fig. 1-2. 



Pcdamoims clarkl E. Hitchcock, '58, p. 127, pi. 23, fig. 2 ; pi. 44, fig. 2. 



Speci-fic characters. Pes: divarication of digits I and II, 25°; of II and III, 30°; of 

 HI and IV, 15°. Length of digit I, .137 m.; of H, .165 m.; of HI, .217 m.; of IV, .153 

 m., measured from the extremity of the heel. Distance between lateral tips, .120 m. 

 Length of foot, .217 m. Length of step, .535 m. Width of trackway, .127 m. 



Manus: length, .090 m.; breadth, .038 m. What appears to be the manus impres- 

 sion lies midway between successive tracks of the pes. There are no plialangeal impres- 

 sions uor distinct claws in the footprints so that the true afiinities of this very rare track 



