FOSSIL FOOTPRINTS OF THE JURA-TRIAS. 



513 



This species is revived although dropped by E. Hitchcock ('65, p. 2) . The resem- 

 blance between it and Anchisaitrijnis tuber atus is very 

 close as regards size and general conformation, except 

 that in the present species the phalangeal pads espe- 

 cially in the middle and outer digits, are much broader 

 and the claws of all three toes are broad and blunted " 

 in contrast to the long, acuminate claw in A. tnheratus. 

 The change of name was necessitated by the fact that 

 the specific name (jiganteus was preoccupied in the 



genus. 



Type, no. ^, of the Hitchcock cabinet; red shale 

 from Turner's Falls, Massachusetts (fig. 34). 



Family OTOZOIDAE. 



With the characters of the genus Otozoum. 



Fig. 34. Euhrontes platyjms Lull. Im- 

 print of the right pes. X 1- From the type 

 specimen, no. i^^, of the Hitchcock cabinet. 



Genus Otozoum E. Hitchcock. (Giant animal.) 



Otozoum E. Hitchcock, '47, p. 54. 



Generic characters. Large tracks, that of the pes being more than twice the length 

 of the manus. Pes plantigrade, tetradactyl, all of the digits pointing forward. Digits 

 broad with well marked phalangeal pads; claws rounded. The foot has a broad web-hke 

 flange extending beyond the tips of the toes, whose probable function was to support the 

 animal in soft mud," possibly, however, for swimming. Manus pentadactyl. Phalangeal 

 formula: (?) 2. 3. 3. 3. 3; digits HI, IV, and V, clawed, fingers half webbed. This 

 manus, if the interpretation be correct, is unique for a dinosaur and subsequent study may 

 remove Otozoum from the order. 



Otozoum moodii E. Hitchcock. 



Otozoum moodii E. Hitchcock. '47, p. 55, fig. 1 ; '58, p. 123, pL 22 ; pi. 23, fig. 1 ; pi. 

 33, fig. 4-5; pi. 46, fig. 5. 



Specific characters. Pes: cHvarication of digits 1 and 11, 25^ of II and III, 4°; of 111 

 and IV, ir. Length of digit I, .196 m.; of H, .230 m.; of 111, .192 m.; of IV, .202 m. 

 Length of foot, .490 m.; to extremity of web, .534 m. Breadth of foot across web. .400 

 m.; distance between lateral tips, .380 m. (pi. 72, fig. F-G). 



Manus: divarication of digits I and II, 53°; of II and III, 40°; of III and IV, 36.5°; 



