24i AN ATTEMPT TO DESCRIBE THE ANIMALS THAT MADE 



acter of the animal, and also the reason wlij some of the tracks 

 were much narrower than others, namely, that one is the fore foot 

 and the other the hind foot. It is quite possible, I think, that there 

 may be four toes in front, certainly on the hind foot, which I take 

 to be the largest, according to a general rule. Plate 15, fig. 5, co])- 

 ied from a track found at Wethersfield, so much resembles the oth- 

 ers, that I do not separate them, although the former shows four 

 distinct toes in front. 



On Plate 19, fig. 4, one of the tracks seems to have a fourth toe 

 proceeding from the outside of the heel. This is not quite certain, 

 though I have endeavoured to copy the specimen. The inner hind 

 toe, also, is wanting on that specimen. But it is not perfect 

 enough to found any important conclusions upon it, save that it 

 shows the manner in which the animal walked. 



Genus XXI. HELCURA. 



Quadrupedal ; tail and feet trailing upon the ground. 



Species 1. Helcura littoralis. (PI. XV. Fig. 1.) 



No. 136 in Cabinet. Specimens also in Mr. Marsh's cabinet. 



Feet from 1 .5 to 2.5 inches long, and from half an inch to an inch 

 wide ; tracks somewhat acuminate, as if the foot trailed on lifting it 

 up, and the trail continuing often interruptedly to the next track. 

 A similar trail, also, seems to have been made by the tail. Tracks 

 somewhat in two rows ; two tracks being usually near each other, 

 and then a wider interval. Plate 15, fig. 1, is copied from No. 

 136, and represents a portion of the trail and tracks of this animal, 

 of the natural size. 



Remarks. — One cannot look upon the specimen (No. 136 of my 

 cabinet) from which Plate 15, fig. 1, was copied, without being 



