CONNECTICUT RIVER SANDSTONE. 37 



better. The impress of the claw of the fourth, or hind toe, is very perceptible in both 

 the right and left footprint, though the toe itself left no mark. 



This species, here arranged by Dr. Deane as of Ornithic character, was probably one 

 of a group of animals described by Dr. Hitchcock as Ornithoid Reptiles, the impressions 

 being those only of the hind feet. Some reference to this and other like cases will be 

 found in the remarks that follow the descriptions here given. 



PLATE VI. 



Fig. 1. This is not described by Dr. Deane. The stone from which the drawing 

 was made is in the collection at Amherst. The impressions are similar in character to 

 those made by the hind feet of the Apatichnus circumagens of Dr. Hitchcock, 

 and may have been made by an animal of that species. See remarks that follow these 

 descriptions. 



Fig. 2. These impressions were described by Dr. Deane in his communication on 

 Fossil Footprints, published in the 4th volume of the Memoirs of the American Academy, 

 New Series. He there says : 



This is a beautiful example of footprints, perfectly developed in all respects. 

 The order of articulations, and the imprint of the tarsus and nails are clear 

 and unequivocal. This variety is common at Turner's Falls. The distinctive 

 features of this species consist in the strongly marked and tapering toes, long 

 and blunt nails, the divergence of the lateral toes, and the broad space which 

 separates them from the central one of the tarsus, which is separated from the 

 toes, and is placed further back than usual. 



PLATE VII. 



The impressions of this Plate are nowhere particularly described by Dr. Deane. 

 Under the classification of the Ichnology of Massachusetts, they must be placed among 

 the many varieties of form presented in the footprints of the species called by Dr. 

 Hitchcock the Brontozoum Sillimanium. The step of this species varied in length 

 from twelve to twenty inches. Width of trackway, about four and one half inches. 



