220 1CHNTTES. 



28105. Three slabs showing footprints; from the reputed Trias of 

 Turner's Falls, Connecticut river, Massachusetts. 



Presented by Prof. C. U. Sheppard, 1852. 



B. Specimens which are probably for the most part of Reptilian 

 origin, although some may possibly be Avian. 



BRONTOZOUM, Hitchcock \ 



Founded on large tridactylate footprints, in which all the digits 

 are directed forwards, the inner digit being the shortest, and the 

 terminal claw long and tubular. There are no impressions of the 

 manus. 



Brontozoum giganteum, Hitchcock 2 . 



Syn. Ornithichnites giganteus, Hitchcock 3 . 



Ornithoidichnites giganteus, Hitchcock 4 . 



The type species ; of very large size, the length of the middle 

 digit being 12*5 inches, and that of the whole foot 14 to 18 inches. 

 Hab. North America. 



20042. Two slabs with impressions of feet ; from the reputed Trias 

 of Greenfield, Massachusetts. Purchased, 1846. 



Brontozoum sillimani, Hitchcock 3 . 



Syn. Ornithoidichnites sillimani, Hitchcock 6 . 

 Brontozoum sillimanium, Hitchcock 7 . 



Founded on smaller tracks than those of the type, in which the 

 middle toe has a length of 6 inches, the total length of the foot 

 being 8 inches. 



Hab. North America. 



36593. Slab showing the impression of a foot; from the reputed 

 Trias of the Connecticut river, Massachusetts. 



Presented by Prof. Hitchcock, 1862. 



Brontozoum validum, Hitchcock 8 . 

 Hab. North America. 



1 Mem. Amer. Acad. ser. 2, vol. iii. p. 169 (1848). 



2 Amer. Journ. ser. 1, vol. xxix. p. 316 (1836). — Ornithichnites. 



3 Loc. cit. 



4 Final Rep. on Geology of Massachusetts, vol. ii. p. 484 (1841). 



5 Amer. Journ. ser. 1, vol. xlvii. p. 317 (1844). — Ornithoidichnites. 



6 Loc. cit. 7 Mem. Amer. Acad. ser. 2, vol. iii. p. 171 (1848). 

 8 ? Ichnology of New England (1858). — Not seen. 



