1869. | 
4. Dinosauria from the 
Trias of North America. 
The Trias of North 
America has yielded the 
remains of two forms of 
reptiles, Clepsysaurus and 
Bathygnathus*. 'Theteeth, 
jaw-fragments, and verte- 
bree of these reptiles have 
characters which are quite 
in accordance with those 
of the Dinosauria,to which 
group they have lately been 
referred by Cope and Leidy, 
and I entertain no doubt 
that they are Dinosauria ; 
but, unfortunately, none 
of the remains which have 
been discovered belong to 
what may be called dia- 
gnostic bones, such as the 
ium, the femur, or the 
tibia. 
5. The Arctogeal province 
constituted in Triassic 
times. 
Assuming, provisional- 
ly, that these reptiles are 
Dinosauria, the distribu- 
tion of that group and of 
the other eptiha and 
Amphibia of the Trias 
may be tabulated in the 
annexed form. 
Putting together all the 
facts now ascertained re- 
specting the distribution 
of the “ Poikilitic” Rep- 
tila, I think that the hori- 
zon of all these beds tends 
to become definitely Tri- 
assic rather than Permian. 
And, in conclusion, I 
may draw attention once 
* See the memoirs by Lea 
and Leidy in the second volume 
of the second series of the 
* Journal of the Academy of 
Natural Sciences.’ 
VOL, XXVI.— PART I. 
HUXLEY—TRIASSIC DINOSAURIA. 
49 
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