FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 485 



This form is distingviisliecl from B. gracilis by its smaller size aud much shorter hmbs 

 and wider body, in fact it seems somewhat doubtful whether the species should properly be 

 referred to this genus ; it surely is not a typical Batrachopus. 



Type specimen, no. ^, of the Hitchcock cabinet, on reddish shale ; locality 

 imrecorded. 



Batrachopus bellus (E. Hitclicock). 

 Apatichnus hellus E. Hitchcock, '58, p. l"l, pi. 17, fig. 6; pi. .35, fig. 8; pi. 45, fig. 6. 



Sjieclfic characters. Pes: divarication of digits II and III, 30°; of III and IV, 30°, 

 Length of digit I, .005 m.; of II, .010 to .018 m.; of III, .020 to .025 m.; of lY, .015 to 

 .020 m. Length of foot, .026 m. 



Manus: divarication of outer toes, 40°. Length of foot, .013 m. Length of step, 

 .100 to .170 m. Width of trackway, .063 m. Ratio of foot to step, about one to six 

 on the average. 



This form is long of limb and strictly quadrupedal in gait thougli the light impression 

 of the manus is not always discernible. The latter character removes it from Apatichnus 

 and both characters would tend to ally it with Batrachopus. In size it lies between 

 B. gracilis and B. gracilior but the length of limb would place it nearer the former. 



The type is no. H, of the Hitchcock cabinet, on red shale, from Turner's Falls, 

 Massachusetts. 



Genus Cheirotheroides E. Hitchcock. (Chirotherium-like.) 



Cheir Other aides E. Hitchcock, '58, p. 130, pi. 23, fig. 4; pi. 36, fig. 6; pi. 54, fig. 3. 



Generic characters. Quadrupedal in gait; feet unequal in size, pes functionally tet- 

 radactyl, manus pentadactvl. The three inner digits of the pes generally terminate in 

 pellets, the fourth digit does not. The presence of a fifth digit to the pes is apparently 

 indicated in some specimens, but rarely impresses itself. The limbs are rather short, the 

 ratio of foot to step being as three to four, though the length of step varies. 



Cheirotheroides pilulatus E. Hitchcock. • 



Cheirotheroides pilidatus E. Hitchcock, '58, p. 130, pi. 23, fig. 4 ; pi. 36, fig. 6 ; pi. 54, 

 fig. 3. 



Specific characters. Pes : divarication of digits I and II, 10°; of II and III, 15°; of III 

 and IV, 15°. Length of digit I, .010 m.; of II, .014 m.; of III, .018 m.; of IV, .018 m. 

 Length of foot, .225 m. Distance between lateral tips, .014 m. 



