492 RICHARD SWANN LULL ON 



foot is amu'ctaiit Ijetweeii Anchisauripus ami Euliroiiti'.s. tlie acumiuate claws aud small 

 size alone among the known characters affiliating it witli the former. Unfortunately, the 

 type specimen, no. ", has been so trinuued as to destroy the hallux impression if it were 

 present so that the presence or absence of this characteristic mark cannot be ascertained 

 (fig. 10). 



'i'he type, no. -j, of the Hitchcock cabinet, is on red shale from Turner's Falls, Mass'a- 

 chusetts. 



Family GIGANDIPODIDAE. 



FaiiiUi/ rhararters. Large bipedal forms. Tetradactyl, hallux half rotated, incum- 

 bent. Foot flatly digitigrade. Claws acuminate. No manus impres.sion. Caudal trace 

 sinuous and continuous. Genera: Gigaudipus, possil)ly also Hyphepus. 



Genus Gigandipus K. Ilitchfock. (Giant foot.) 



Gifjad'ipKs Vj. Hitchcock, 55, p. 417 (no description) . 

 Gigandipu.'i E. Hitchcock, '56, p. 'J7. 

 Giyantitherium E. Hitchcock, '58, p. '-'o. 



Generic rliuraeters. Bipedal, tetradactyl, hallux incumbent, that is, inserted low on 

 the leg so that its whole length is on the ground ; rotated at right angles to the second 

 toe. Hallux but feebly developed. Foot with distal ends of metatarsals upon the ground 

 in contrast to Anchisauripus in which the foot rests upon the toes only. Claws acumi- 

 nate; that of digit 11 especially strongly developed. Tracks nearly in a right line. 

 Caudal trace sinuous and continuous. 



The foot of this form agrees very closely in structure with that of AUosaurus 

 (Osborn. :00, p- T<S5, fig. 4) and it was from the limb of that genus (American museum 

 of natural history, fossil reptile collection, no. 290) that the studies for the bone restora- 

 tion of Gigandipus were made. 



Gigandipus caudatus E. Hitclicock. 



Gigadijjus caudatus E. Hitchcock, '55. p. 417 (no description). 



Gigandipus caudatus E. Hitchcock, '56, p. 'J7, text figs. 



Grigantitherium caudatinn E. Hitchcock, '58, p. 93, pi. 16, fig. 1-2; pi. 44, fig. 4. 



Specific character s. Divarication of digits I and 11,98°; of H and Hi. 22°; of HI 

 and IV, 30°. Length of digit 1, .080 m. ; of digit 11, to metatarsal pad, .215 m. ; includ- 

 ing the pad, .280 m. ; of Hi, to metatarsal pad, .275 m. ; of IV, to the pad, .290 m.; 



