■530 RICHARD SWANN LULL ON 



'I'lic ivpe speciiiK'n is no. -^, of the Hitchcock cabinet, from Turner's Falls, Massachu- 

 setts. 



<ienu(< Amblypus K. Hitchcock. (Blunt foot.) 

 Ajj/I////j/iis E. Hitchcock, '58, p. l-to. 



Generir cluiriictrrn. Impression of right hind foot only in all of the several speci- 

 mens which exist. Pes plantigrade, tridactylous with the digits curving inward. No 

 morphological characters. Man us unknown. 



All of the specimens are probably the impressions of a single individual which may 

 have been walking along the shore so that the surface under but one foot was in condi- 

 tion to take an impression. Hitchcock thinks the animal a Chelonian as the foot 

 " approximates to that of some tortoises." 



Amblypus dextratus K. Hitchcock. 

 Aiiil)/t/j))is (h'xtratns E. Hitchcock, '58, p- Ho, pi. 25, fig. 7 ; pi. 48, fi"-. 5. 



Specific characters. Pes: length of the foot, .025 m.; breadth, about .015 m. Dig- 

 its not separated. Length of step, .100 to .115 m. 



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

 Massachusetts. 



Genus Helcura E. Hitchcock. (Tail dragger. ) 

 Ilclcnra E. Hitchcock, '48, p. 244. 



(reiicric chi/ractcrs. " Quadrupedal ; tail and toes often dragging on the ground." 

 IJroad body trace. 



These traces give absolutely ikj data concerning the form and structure of the feet. 

 Hitchcock compares tlic markings to those left by living land tortoises and hence classes 

 them provisionally with the Chelonia. 



The species are : — 



Helcura anguinea K. Hitcluock. 

 Ilelrtira aiujiiiiied E. Hitchcock, '58, p. 141, pi. oli, fig. 9. 



S^K'clfic characters. Length of .stride of the same foot, .125 to .150 m. Width of 

 trackway, .075 ni. 



Type specimen, no. -"f, of the Hitchcock cabinet, on gray .shale, from Turner's Falls, 

 Massachusetts, 



