122-h 



THE EXTINCT BATRACHIA, UKITILIA 



Line*. 



00 K 



sion. Therefore the inner face is the mosl extensive, and the posterior the least so. It differs from the same part in 



II. foulkei, in its less angularity, especially in the more rounded, and less defined posterior face. The Internal face 



narrows downwards, and while the greatest diameter of the fragment above is antero-posterior, below it is diagonal, 



the anterior point being the inner. 



Measurement*. 



A.ntero-posterior diameter above, 



Transverse " " 



" " medullary cavity, 20.5 



The portion of fibula is the distal, and resembles that of Hadrosaurus foulkei, in being slightly expanded near 



the extremity, and cylindric in the lower part of the shaft. In both genera and Ornithotarsus, ('ope. the distal ex- 

 tremity of the fibula is less attenuated than in [guanodou. 



Lines. 

 Transverse distal diameter, 40.5 



do. live inches above. 30 



The right infernal metatarsus also hears considerable resemblance to that of II. foulkei. lis proximal extremity 

 is much more convex in its inner outline (ban in that species. The inner proximal fare is plane and longitudinally 

 wrinkled. The proximal or tarsal articular face is concave anteriorly; its plain; is at right angles to the a.xis of the 

 shaft of the bone. If is strongly oblique in Hadrosaurus foulkei, and a, rib-like prominence of the outer face crosses 

 the latter obliquely and at right angles to the proximal extremity. No such rib exists in the present case, because 

 the weight was supported by the shaft of the bone, directly and not obliquely as in Hadrosaurus. Thus the Hypsi- 



hemae walked more exactly on the toes than did the I ladrosauvi. 



The posterior margin is thinner, and as in II. foulkei, presents a, rather small median protuberance. The distal 



condyle is broken away, but the twist of flic; distal portion or the shall, shows thai it, wa,s directed iiwiiy from the ad- 

 joining metatarsal, posteriorly. 



Measurement). 



Length from antero-superior to postero-inferior extremity (inferior articular face 



Worn a. way ). 



Transverse diameter proximally, 



" " medially, 



Anfero-posferior do. do.. 

 The diameters of the; shaft are somewhat, larger than in the IT. foulkei given by Leidy. 



The caudal vertebra is of large size and peculiar form. The centrum is considerably wider than deep, and consider- 

 ably longer than wide. The posterior chevron articulations are small, and each is connected with each anterior by a 



strong rounded angulation, Between tin; latter the space is wide and slightly concave in transverse section, least so me- 

 dially. A marked peculiarity is seen in the strong longitudinal ridge which divides the lateraJ surface of the vertebra 

 into two nearly equal faces. The neural arch is elongate, flic neural ea,nal small, in section a, short vertical ellipse. The 

 articular face of tin' zygaphophyses makes an angle of about thirty-five degrees to the perp licular. The crest, of the 



arch rises a, half inch behind these into the very stout basis of the neural spine, the greater part, of which, with the; 

 posterior zygapophyses, is broken off. The inclination of the base is at about 85 ' to the vertical diameter of the bone. 

 The articular faces are both slightly concave, a,s are the lateral fares which are separated by I he lateral ridge. 



Length of centrum, 



" " basis neural arch, 

 Width posterior articular face. 



Depth do. medially, 

 " " laterally, 



" basis neural spine, 



Transverse diameter neural canal behind. 



Width between latero-inferior ridges, 



" vertical, of face of zygapophyses, 



There is a slight rugose protuberance in the position of the diapophysis 



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