is; 
Cope. ] 2 1 4 [Nov. 17, 
In. Lines. 
Depth 2 MeOdiAlly; craps cacao gl aes 2s 2 8 
me a laterally: .assatisses Shu mee se 3 3 
Tt. WASIA JCM ALS DING. ss loanilcmieapeten seeds 12 
Transverse diameter neural canal behind....... 10 
Width between latero-inferior ridges...... a ccabey i 9 
‘* - vertical face of zygapophyses.. «oe. ss.s 11 
There is a slight rugose protuberance in the position of the diapophysis. 
The peculiarities of this vertebra indicate most strikingly the generic 
distinctness of this great reptile from the Hadrosaurus. It is true it 
presents some similarity in form to the terminal caudals of that genus 
and if it could be referred to that portion of the series, would indicate 
merely another and larger species of Hadrosaurus. It differs inform from 
these vertebrae, in its depressed instead of compressed form, and its 
lateral angulation. That it belongs to a more anterior position in the 
tail is evident from the very large size of the basis of the neural spine, 
and general greater development of the neural arch and zygapophyses, 
and the trace of diapophyses. Further, it is over four times the size of 
the terminal caudals of H. foulkei, while the remaining elements do not 
indicate any such extraordinary dimensions. A position a little behind 
the middle of the series would relate well to the other proportions. 
This is another of those remarkable forms which the reptilian type 
developed in past ages. That it was herbivorous, and relied less on its 
tail for support than Hadrosaurus, appears probable. Large caprolites 
of the character of those of herbivorous animals accompanied the bones. 
They resemble somewhat those of the hog ; one has a diameter of 3.5 inches 
one way, and 2 inches the other; extremity broad, obtuse. The pro- 
prietor of the pit told the writer that he had more than once seen large 
‘*hoofs’? ‘‘and wide toe-joints’ taken out during the excavation. 
This species is different from the Ornithotarsus immanis, Cope, and 
belongs to a different genus. The shaft of the tibia in the latter is filled 
with cancellous tissue ; in the present.animal it is entirely hollow. 
From the marl pits of James King. 
Haprosaurvs, Leidy. 
HADROSAURUS TRIPOS, Cope. 
Ata point about ten miles distant from the marl pit in which the 
Hypsibema was found, Prof. Kerr discovered a caudal vertebra of a 
colossal reptile, whose affinities are evidently near to the Hadrosaurus 
foulkei. 
This vertebra is one of the distal, as evidenced by the entire absence 
of any trace of diapophysis, and its subquadrate longitudinal section, as 
well as by the small size of the neural arch and spine. At first sight it 
would appear to occupy a position between the thirtieth and thirty-sixth 
of the series; the former in H. foulkei has, however, rudiments of a 
diapopbysis. Both its articular faces are distinctly biconcave. The large 
