258 DESCRIPTION OF FIVE NEW SPECIES 



on the under side. Claws from an incli to an incli and a half long ; 

 showing along the whole length, the impression of a rounded web 

 or membrane ; which did not sink as deep as the claw. Middle toe 

 extending three inches beyond the lateral toes. Length of the mid- 

 dle toe, five or six inches. Length of the foot, seven to nine inches. 

 Length of the step, undetermined. 



The sketch of this track given on PL XI, f. 1, of the natural size, 

 was taken from two specimens of almost exactly the same size. 

 One of them exhibited all the track perfectly, except the middle 

 toe ; which was supplied from the other. Both were obtained 

 from Turner's Falls. 



The second species of Pterodactyli was from the same locali- 

 ty ; and on several accounts possesses a good deal of interest. 

 From its resemblance to the foot of the Cinereous Coot, {Fulica 

 Americana,) I have denominated it Ornithoidiclmites falicoides. 

 Its characters are as follows : 



Ornithoidichnites fulicoides. Toes three, all in front, spreading 

 eighty degrees : the middle one extending one inch and a quarter 

 further forward than the lateral ones. Tuberous swellings, two on 

 the inner toe, three on the middle toe, and four on the outer toe ; 

 very distinct. Impression of a curved fleshy membrane on all the 

 claws : the nail making a depression in the middle, and deeper than 

 any other part of the foot. Length of the middle toe, two and a 

 half inches : of the foot, four inches : of the step, from eight to ten 

 and a quarter inches. Shown of the natural size in PL XI, f 3. The 

 part colored darker near the extremity, shows the deeper impression 

 made by the claw. 



This species differs from O. Lyellii in two decided characters : 

 first, in being twice as divaricate: secondly, in the much. less ex- 

 tension of the middle toe beyond the others. It is, also, much 

 smaller. It differs from the O. expamns of my Report, in the 

 impression of a membrane around the claw. If it should be 

 found that the O. ciineatvs of Dr. Barratt has such an impression, 

 it could hardly be separated from the O. fulicoides. But my spe- 

 cimens of the O. cinieatus are not distinct enough to settle this 

 question : yet Dr. Ban-att's representations would lead to the con- 

 clusion that no such membranous impression exists. I strongly 

 suspect that the row of tracks figured on Plate 48, figure 5d^ 



