222 ICHNITES. 



20045. A small slab with several tracks of A. intermedins and A. 

 gracillimus, and also of Anisopus gracilis ; from the re- 

 puted Trias of Greenfield, Massachusetts. 



Purchased, 1846. 



Tracks of A. intermedins and A. gracillimus are also shown on 

 the slab 20045 a (supra, p. 22). 



GRALLATOR, Hitchcock \ 

 Small forms founded upon impressions of the tridactylate hind 

 feet. 



Grallator cuneatus, Hitchcock 2 . 

 Hah. North America. 



Tracks of this form are shown on the slabs 20045 a and 18322 

 (p. 22). 



TRIDENTIPES, Hitchcock 3 . 

 Another genus founded upon tridactylate prints of the hind feet. 



Tridentipes elegantior, Hitchcock 4 . 



Hab. North America. 



Tracks of this form are shown on the slab 18322 (p. 221). 



1 Ichnology of New England, p. 72 (1858).— Not seen. 



2 Loc. Git. 



3 Ibid. p. 88. —Not seen. 



4 Loc. cit. 



