FOR THE ADVANCEMENT OF SCIENCE. 563 
eee M. Wheatle ey. A portion of these was — They included 
bones of the extremities, pelvis, and vertebrae. The femora measured 
about thirteen inches in ——— It was bitis Belodon ote us. 
wiTh 
ican Trias that such was the case. us there was much greater diffi- 
culty in distinguishing the Crocodiles and Dinosauria of the Trias, than 
those of the Cretaceou This was to be es lly seen in the forms o 
the vertebræ, and the femora. The Rhynchocephalia and Thecodontia 
were Triassic groups still more generalized and intercalated between the 
preceding and the later orders Lacertilia and Crocodilia. In the case of 
^ period 
Sandstone and Montrose Sandstone of Vanuxem with the Hamilton and 
r 
The sandstone referred to had been termed in the annual reports of Mr. 
Vanuxem the Montrose sandstone and Oneonta sandstone; the former a 
well marked locality in Pennsylvania; the latter n New Y York. This 
sandstone had been regarded as the terminal rock ee the series; and as 
section from near the ind to the top of the dign without recognizing 
any important subdivisio 
In the final nom NN. the term Pita group was adopted for the 
entire series. A red sandstone, which had been observed farther to the 
. Westward, along the Tioga River and ipo the borders of New York and 
Pennsylvan ia, containing "eats and bones of Holoptychius ae regarded 
as part of the same group. Since this red sandstone of Tioga was 
known to thin out to the westward, it gave support to the hypothesis 
that’ it was only the thinning western extension of the formation which 
was so largely developed in the Catskill Mountains. 
In the central and western parts of the State the limits of the Hamilton, 
Portage in Chemung groups, had been pretty well defined, the two latter 
occupying a great breadth in the southern counties. In the coloring of 
the map the great breadth given to the Catskill group in the eastern coun- 
ties reduced the Chemung and Portage to a narrow belt giving an incon- 
. 
