HATCHER: OSTEOLOGY OF HAPLOCANTHOSAURUS 2) 
dently pertain to the same series as the nine dorsals and the differences in the spines, 
positions of the rib facets, ete., demonstrate that a number of dorsals are missing 
between this first dorsal and the anterior of the series of nine posterior dorsals ; 
while the remains of a second skeleton pertaining to a different species of the 
same genus fixes the number of missing dorsals at four. This would place the num- 
ber of free dorsals in the present genus and species at fourteen instead of ten, the 
probable number in Diplodocus and Morosaurus. It is possible, however, that in the 
Dinosauria the number of dorsals may vary in different individuals within the same 
species as is well known to be the case in numerous instances in the Mammalia. 
The bones within the dotted lines in the upper left-hand corner of the first dia- 
gram (Fig. 1) for the most part pertain to and constitute the type of a new species 
of Haplocanthosauwrus, which will be described later in this paper. The shaded bones 
Scale about 12 feet lo 1 inch 
Fic. 2.— Diagram of that portion of bone quarry near Canyon City, Colo., worked by Mr. W. H. 
Utterback for Carnegie Museum. The lower irregular line shows limit to which quarry had been worked 
by the Jate M. P. Felch for Professor Marsh. 
within the dotted lines and the scapula and coracoid beneath pertain to one or more 
genera different from Haplacanthosaurus. The relative positions of these bones as 
they lay imbedded in the sandstones are well shown in the diagrams and will be re- 
ferred to in detail, when we come to describe the species of which they form the type. 
The quarry from which these remains were recovered is the one long worked by 
Professor Marsh. It is situated on the west side of Oil Creek (Four Mile Creek) at 
the entrance to Garden Park and some nine or ten miles east by north of Canyon 
