36 ICHNOGRAPHS OF THE 



This is a beautiful specimen of the left and right foot of a bird, probably 

 no larger than the preceding; but the impression differs in this respect, that 

 the toes are more numerous and less massive. The phalangeal ranks are not 

 very distinct-; but the general features of the track are very striking. Specimens 

 are rare; I have only seen them at a place called the Race, at the uppermost 

 locality of fossil footprints, four miles above Turner's Falls. This example of 

 footprints is strictly analogous to those of several families of the existing order 

 Passerineae. 



Fig. 3. Of this no description has been given by Dr. Deane. The impressions do 

 not, however, differ essentially from that of figure 1, and may have been made by an 

 individual of the same species, though the footprints are slightly larger and the step con- 

 siderably longer. 



PLATE IV. 



Dr. Deane has left no account of these impressions. Figs. 2 and 4 represent, undoubt- 

 edly, footprints of the species described by Dr. Hitchcock as the Grallator gracillimus, 

 and Fig. 3, that of the Grallator tenuis, in his great work on the Ichnology of Massa- 

 chusetts. Fine specimens of the tracks of these species may be seen in the magnificent 

 collection at Amherst, from some of which the figures here given were probably drawn. 



The G. gracillimus had a step or stride' of about eight inches, and the width of 

 trackway made in walking was about three and one half inches. The step of the G. 

 tenuis was about nine inches, and width of trackway made, two and one half inches. 



PLATE V. 



This plate was not described by Dr. Deane, though he refers to it, in some general 

 remarks upon the footprints, as exhibiting the impress made by the extremity of the nail 

 of the fourth toe of the bird. 



The stone from which this plate was drawn is now in the possession of Roswell 

 Field, Esq., a gentleman who is doing much towards the elucidation of the character of 

 the animals that made the footprints, by his indefatigable perseverance in working out 

 specimens from the localities in his neighborhood, near Turner's Falls, and by his accurate 

 observations upon them. 



It would be difficult to give upon paper a finer representation of any object in 

 nature than is afforded, by this plate, of the original stone. The drawing could not be 



