178 AN ATTEMPT TO DESCRIBE THE ANIMALS THAT MADE 



the track shallow. (Other characters the same as those of the 

 Brontozoum, except in respect to the extremity of the tarso-meta- 

 tarsal bone, whose characterjn this genus has not been observed.) 



Species I. ^Ethyopus Lyellianus. (PI. IV. Fig. 1.) 



Orniihoidichnites Lyellii, Transactions of Assoc. Amer. Geolo- 

 gists, Plate 11, fig. 1. 



Nos. 57, 58, in Cabinet. 



Divarication of the lateral toes, 35^ ; of the inner and middle 

 toes, 15'= ; of the middle and outer toes, 20=. Length of the mid- 

 dle toe, 6.4 inches ; of the inner toe, 4.2 inches ; of the outer toe, 

 5.2 inches ; of the claw, 1 inch ; of the foot, 7 to 9 inches. Dis- 

 tance between the tips of the lateral toes, 4.8 inches ; between the 

 inner and middle toes, 4.1 inches ; between the outer and middle 

 toes, 3.9 inches. Projection of the middle toe beyond the lateral 

 ones, 3.3 inches. Width of the toes, 1.1 to 1.8 inch. Length of 

 the proximal phalanx of the inner toe, 1.6 inch ; of the last two 

 phalanges, 1.8 inch; of the first on the middle toe, 1.8 inch; of 

 the second, 1.8 inch ; of the last two, 1.7 inch; of the first on the 

 outer toe, 1.2 inch ; of the second, 1.2 inch ; of the third, 1 inch ; 

 of the last two, 1.5 inch. Toes straight; flat beneath, winged. 

 Claws winged, broad, unusually lateral in their origin. Track 

 shown, of the natural size, on Plate 4, fig. 1. 



This species is dedicated to Charles Lyell, Esq., of London, 

 whose researches in respect to fossil footmarks have been very im- 

 portant. 



Remarks. — This remarkably distinct species has been found only 

 at Turner's Falls, and in single detached specimens ; so that the 

 length of the step has not been ascertained. As to the possibility 

 of its being the Brontozoum loxonyx, see my remarks following the 

 next species. 



