AND AVES OF NORTH AMERICA. 



Hi) 



Fig. 33. 



Fifi. 33. 



Fig. 34. 



Fig. 32a. 



These indicate a more or less elongate metatarsal region and elevation of the heel 

 above the ground. 



Upper cretaceous, upper green sand bed Monmouth Co., N. J. 



COELOSATTRTTS, Leidy. 



Another bird-like type of dinosaur, like Laelaps. The only species known is of .more 

 slender build and smaller size than the latter. The bollowness of its bones, etc., indicate 

 its powers as a runner or leaper. But few remains of the genus have been procured. It 

 is known only from one tibia. From this slight indication the degree of difference in 

 general structure is not readily attainable. The tibia, is in all its proportions more slen- 

 der, and presents a higher crest; its distal articular surface is more transverse to its longi- 

 tudinal axis. The species C. antiquus has been much smaller, and more lightly built ; the 

 tibia is about one-fifth tire size of that of];, aquilunguis. 



COHLOSAURUS ANTIQUUS, Leidy. 



Grot Rept. p. 119 (name) & 100. Tab. Ill, f. 1, 18C5. 



Cretaceous green sand of New Jersey. 



BATIIYGNATIIUS, Leidy. 

 BATHYGNATIIUS BOREALIS, Leidy. 

 Leidy, Journ. Ac. Nat. Sci., Pliila., 1854, p. 327, Tab. xxxiii. 



Known only from a portion of mandibular ramus with teeth. Probably one of the 

 types whose tracks are preserved in the red sandstones of the Connecticut Valley. 

 Though placed among the Thecodonts by Owen, I greatly suspect that its true place is 

 here. Triassic red sandstone of Prince Edward's Island, New Brunswick. 



