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GROUP SEVENTH. 
The seventh group contains the impressions of the 
feet of Saurians or lizards. We have a specimen of 
quadrupedal marks, with five toes to each foot, about 
an inch long, which may have been made by these 
animals. The impressions are small, but very distinct. 
There are lizards of the present day with five toes, 
about the size of these impressions; and these may, 
therefore, be set down as belonging to this order of 
reptiles. Like a number of the last-named specimens, 
they are in red shale. 
GROUP EIGHTH. 
The eighth group is assigned by President Hitch- 
cock to the Chelonian or turtle tribe. The slab bear- 
ing impressions of Brontozoum Gracillimum has a 
mark about fourteen inches long and two wide, which 
may be attributed to the plastron or breast-plate of the 
tortoise. On the slab from Turner’s Falls there is a 
longitudinal furrow, which might have been made by 
the tail of a turtle; and in various of our slabs are 
impressions which we think belong to this tribe. We 
