AND AVES OF NORTH AMERICA. 



122-g 



marrow, and not by cartilage. Prof. Wyman regarded them as those of a reptile, though 

 the long hones might have been referred to a bird if considered alone. "While the bones 

 from Springfield arc as hollow as those of the Pterodactyle, I do not find that they arc 



those of this animal ; there is no positive proof of the Long fingers nor of the broad sternum 



which these reptiles possessed. The existence of the large toe in company with the small 

 one is in liivor of a jumping animal." (Ichnology of Massachusetts, 1858, 187.) 



A figure of the right fore foot accompanies Prof. Hitchcock's description, of which it 

 is to be observed that the metacarpals are too stout, and the earpals arc omitted. The 

 third phalange of the second toe is ungueal. 



APPENDIX TO THE DINOSAURIA. 



HYPSIBEMA, Cope 



Char. jini,. Proportions of limbs and feet much as in Hadrosaurus. The caudal ver- 

 tebrae elongate and depressed, in the median part of the series. 



The elongate depressed form of caudal vertebrae, distinguishes this genus from Had- 

 rosaurus, The latter possesses elongate vertebrae near the extremity of the scries, but 

 anterior to Ibis point, I hey an- first subquadrate in profile, then proximally much nar- 

 rowed. 'Hie form exhibited by the known species of this »'cii!is is more like that of Hv- 

 laeosaurus Mant. 



BYPSIBEMA CRASSICAUDA, Cope. 



The remains on which this species is founded oonsist of the distal extremity of the right humerus, a portion of th« 

 shaft of the left tibia, a portion of the fibula, the right internal metatarsus somewhat broken, and a caudal vertebra. 

 There are other uncharacteristic fragments, mid a piece; which may In: a dermal bone. 



A.ssociated with them are several coprolites of large animals. 



These species indicate an animal of about I lie size of the Hadrosaurus foulkei, Leidy, and with a similar dispro- 

 portion in the lengths of the limbs. This is readily appreciated on comparison of the huge metatarsus with the light 

 humerus. The medullary cavity of (lie tibia is large; that of the humerus small. 



The portion of the humerus preserved is Injured, and the condyles are worn. lis relation to that of II. foulkei is 

 readily determined, and <>n comparison the following marked differences appear: The ridge connecting the external 



e lyle with the shaft posteriorly is acute; if is rounded in II. foulkei. External distal face is fiat or slightly ooncave' 



in II. foulkei somewhat rounded, it is at right angles to the plane of the anterior face, and forms with it rather less 

 than a right angle; in II. foulkei this region is rounded. Distally the shaft is much flattened in II. orassieauda. 



Measurements. 



Antero-posterior diameter of shaft, just above condyles, 

 Width external face distally, 

 olecranar fossa, 



" condyles, (estimated) 



Lima. 



20.3 



Ki 

 64 



The anterior face at over three inches above the condyles is slightly concave. About 1.5 inches above the articular 



face of the externa] condyle, II cute ridge dividing the posterior and external laces disappears, and the surface be 



comes regularly rounded, 



The portion of the tibia is from the shaft of that Of the lefl side, just below the superior antero-posterior ex pa n 



