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HATCHER: OSTEOLOGY OF HAPLOCANTHOSAURUS 
Conclusions as to the Habits of the Sawropoda. 
In discussing the probable habits of Diplodocus in his memoir on that genus, the 
present author remarked : “JI am inclined toward the opinion that Diplodocus was 
essentially an aquatic animal, but quite capable of locomotion on land.” I would 
now after a more thorough study of the osteological characters of several Sauropod 
genera in connection with more extended geological observations since conducted 
and bearing upon the probable physiographic features, during Jurassic times, of the 
regions in which Sauropod remains have been found in more or less abundance, 
amend this statement of my opinion as follows, making it applicable to the Sauro- 
poda generally. ‘ 
I believe: That the Sauropoda were essentially terrestrial reptiles with amphibious 
habits, passing much, perhaps most, of their time in shallow waters where they were able 
to wade about im search of food. That their natural and normal mode of progression 
was ambulatory, as is abundantly evidenced by the structure of their feet and limbs, but 
that they were quite capable of swimming when throwgh choice or necessity they essayed 
the deeper waters of the larger lakes and streams, to which they must frequently have 
been driven to resort for protection from their natural enemies, the contemporancous 
carnworous Theropoda with habits probably still less aquatic than were those of the 
Sawropoda. 
Origin of the Atlantosaurus Beds. 
I have elsewhere (An. Car. Mus., Vol. I., pp. 8327-341) described in some detail 
the geology of the country in the immediate region of the dinosaur quarries near 
Canyon City, Colorado. It may be of interest in this connection however to 
describe in greater detail some of the more important quarries of this region, ren- 
dered classic by the researches of the late Professors O. C. Marsh and E. D. Cope, 
and to describe the character of the various strata which in this region constitute 
that series of sandstones, limestones, shales and marls which together make up the 
450 feet of supposedly Jurassic deposits lying between the ‘“ Red Beds” below and 
the Dakota sandstones above. Dr. C. A. White in his article entitled: MHresh- 
Water Invertebrates of the North American Jurassic published as Bulletin 29 of the 
United States Geological Survey on pages eleven and twelve speaks as follows of 
these deposits: “The character of the strata in which the fresh-water Jurassic 
fossils were found, both at the Colorado and the Wyoming localities, in addition to 
the character of the fossils themselves, is such as to indicate for them a lacustrine 
and not an estuary or a fluviatile, origin; that is the rocks are regularly stratified 
and have such an aspect and character as to indicate that they were deposited in 
one or more large bodies of water. If the strata of the Colorado and of the Wyom- 
