CONNECTICUT RIVER SANDSTONE. 47 



This species, like the last, Dr. Hitchcock considers to have been a Marsupial, and 

 he has named it Anisopus Deweyanus. 



Fine slabs, with the footprints of both the above species, are to be found in the 

 cabinet at Amherst. 



PLATE XXVII. 



Fig. 1. The original of this is to be found in the collection of Mr. Roswell Field. 

 The stone has six tracks, but two of which are given. They are of an anomalous 

 character. 



Fig. 2. The footprints of this plate are of ornithic character, and, excepting in size, 

 do not differ from those of the Grallator tenuis of Hitchcock. See Plate 4, fig. 3. 



PLATE XXVIII. 



Fig. 1. This, like the last mentioned, is a representation of the track of apparently 

 a small bird. The place of the original is not now known. 



Fig. 2. This is an impression made by a tailed quadruped, possibly the Macrop- 

 terna vulgaris of Hitchcock. The surface upon which these tracks were made was 

 undoubtedly of soft mud, allowing the feet of the animal to sink deep, and consequently 

 causing a distinct imprint of the tail. The specimen from which the drawing was made 

 is in the collection of Amherst. 



PLATE XXIX. 



Fig. 1. This track was figured, and a brief account of it given, by Dr. Deane, in 

 the Memoirs of the American Academy, in 1856. It differs in some respects from the 

 description by Dr. Hitchcock of that made by the Macropterna gracilipes, but may 

 be the same. 



Fig. 2. A representation of these tracks was also given by Dr. Deane in the Memoirs 

 of the American Academy, in 1856, and were then considered by him to have been made 

 by a Batrachian. Subsequently, in a letter, he mentions them as of a character difficult 

 to determine. They may, possibly, have been made by an animal of the same species as 

 the last, though they differ somewhat in the divarication of the toes and in the width 

 of trackway. 



