486 



RICHARD SWANN LULL ON 



Manus: divarication of digits I and II, 57°; of II and III, 6U°; of III and lY, 28°; of 

 IV and V, 20^ Length of digit I, .004 m.; of II, .008 ui.; of III, .009 m.; of IV, .006 in.; 

 of ^^ .004 m. Length of step, .320 m. Width of trackway, .570 m. 



This species resembles Batrachopas gracilior most closely, especially in the short 

 limbs and broad body, but differs therefrom in the pelletrlike character of the claws. It 

 may be that the last character is of specific value only and that the two forms mentioned 

 should be brought together under one genus. The present species is extremely rare and 

 is in need of further study before its true character can be learned. It seems best to place 

 it under the Proterosauria because of its pentadactyl inanus which Gadow claims is never 

 found among the Amphibia. However, it seems quite far removed from the typical 

 Batrachopus. 



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

 This is specimen no. l^ of the Ichnology. 



Superorder Dinosauria Owen. 



Ordinal characters. ' Bipedal in gait. Pes ornithoid, structurally tri- or tetradactyl, 

 though generally functionally tridactyl. Manus never impressing (Megalosauria) , or 

 occasionally resting upon the ground (Orthopoda), but never used for locomotion. 

 Manus pentadactyl. Caudal trace sometimes present. 



Order THEROPODA Marsh. 



Strictly bipedal, digitigrade forms, with a tetradactyl mesaxonic foot, functional, 

 subfunctional, or vestigial hallux. Claws acuminate but not strongly recurved in Triassic 

 forms. Lunbs moderately long and trackway narrow. Occasional tail trace. 



Family ANCHISAURIPODIDAE. 



Footprints of dinosaurs of the family Anchisauridae. 



Family characters. Bipedal, tetradactylous; hallux, when impressing, rotated to 

 rear, insistent. Well marked phalangeal pads; anterior claws acuminate, but not 

 strongly raptorial. No manus nor caudal impressions. But one genus: Anchisauripus. 



Genus Anchisauripus gen. nov. (Foot of Anchi,sanru8.) 



Mibrontes E. Hitchcock, '45b. p. 23 (in part) . 

 Brontozovm E. Hitchcock, '47, p. 50 (in part) . 



' Definition applying to Connecticut valley dinosaurs. 



