﻿DEANE ON THE SANDSTONE FOSSILS OF CONNECTICUT RIVER. 175 



Fig. a, diagram A, pi. 20, is an imdescribed species of quadrupedal imprints. The foot- 

 prints are defective, being impressed when the mud was too soft to retain forms, but 

 this condition was favorable to receive the trail of the animal's tail, which is exquisitely 

 preserved. This is a rare feature. 



Fig. b, diagram A, pi. 20, is likewise new and undescribed, and is remarkable for the 

 disparity of the anterior and posterior feet. The fore feet are very perfect, four thick 

 but pointed toes radiate outward and somewhat backward. The posterior feet are 

 comprised of four long, slender toes, lying nearly parallel, and the feet are divergent. 

 Right and left feet widely separated. 



The foregoing species of quadrupedal imprints have never been figured or described. 

 Those which follow are copied from drawings made by myself and published in the 

 Journal of the American Academy of Arts and Sciences a few years since. They are 

 inserted here for comparison, although a simple outline of a foot can convey no 

 adequate idea of its organization. 



Fig. a, diagram B, pi. 20, is remarkable for its peculiar symmetry. Four thick, 

 tapering toes radiate forward, and in the hind foot the impression of the heel is pro- 

 longed backward to a considerable distance, and is broad and flattened. The fore foot 

 is planted a little in advance and a little outward of the hind foot. 



Fig. b, diagram B, pi. 20. The hind foot consists of three thick, pointed toes, widely 

 spread, and a short toe pointing inward. The heel is projected backward, and termi- 

 nates in a rounded extremity. The anterior foot is not conformable to the posterior. 

 Four toes, two pointing forward and outward, and two outward and backward. In 

 birds the foot points inward without exception ; in quadrupedal impressions it diverges 

 outward in every instance I have ever seen except this. The hind foot inclines 

 slightly inward. Both examples upon diagram B are exquisitely beautiful and perfect. 



Fig. a, diagram C, pi. 20, is a series of very delicate foot-prints. Toes four, long and 

 slender, and drag from one step to another. Impression of anterior feet not retained. 



Fig. b, diagram C, pi. 20, is probably Saurian. Toes have a chirotherian look, thick 

 and massive. Feet divergent. The fore foot planted near the hind, sometimes partially 

 obliterated by it. Stride very great. Fig. d, diagram C.'is probably analogous, and 

 both, with the exception of the appendage upon the side opposite the thumb, have a 

 striking resemblance to fig. b, pi. 18. 



The remaining fig. c, diagram C, pi. 20, is probably Batrachian : toes four, feet 

 divergent, impressions of anterior feet not retained. 



The impressions upon pi. 19 are of recent discovery, and the obscurity of their 

 origin is in proportion to their beauty and extraordinary preservation. Nothing of 

 the kind has hitherto been described or even discovered. 



Fig. a of this plate is remarkable for the geometrical symmetry and perfection of the 



dotted impressions, which are arranged in divisions, each a reproduction of the other. 



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