252 MEMOIRS OF THE CARNEGIE MUSEUM. 
tioned. ‘They belong to smaller and in some cases evidently immature individuals. 
These cervicals for purposes of study and comparison have been arranged in series, 
and although it is not absolutely certain in all cases that in this arrangement the 
vertebre belong to the same individual, the arrangement is nevertheless useful for 
purposes of investigation and description. The series thus formed may be enumer- 
ated as follows: 
Catalog No. 1703 A (M. petersoni Holland). 
This series consists of an atlas, axis, and the third, fifth, sixth, and seventh 
cervicals. They are all in remarkably good condition, having sustained very — 
little crushing and breakage. The spine of the fifth cervical is missing, and there 
are a few very minor injuries, which have been sustained at the outer extremities 
of some of the lateral processes. It may be said in passing that this series of 
cervicals has been associated with a series of dorsals and lumbars bearing the 
catalog number 1703 B and C. The size, texture, and color of the bones in these 
cervicals, dorsals, and lumbars conspire to suggest that they all belong to one 
individual. 
Catalog No. 1718. 
The cervicals grouped under this catalog number consist of the atlas, the axis, 
and the last three cervicals. The atlas and axis are in a good state of preservation. 
The posterior cervicals are in a more or less fragmentary condition; they evidently 
belonged to a large, but somewhat immature, individual, as the epiphyses of the 
axis and of the vertebre associated therewith are lost. It is to be observed that 
associated with this cervical series, under the same catalog number, are numerous 
dorsals and lumbars which it is highly probable belonged to the same individual. 
Catalog No. 1720. 
Under this number are placed an atlas, axis, and the fifth, sixth, and seventh 
cervicals. The atlas has been somewhat injured on its upper surface, the neural 
arch having been destroyed. The remaining vertebre have lost the posterior 
epiphyses and have sustained other minor injuries. The specimens are relatively 
quite small in size, and evidently belonged to an immature individual. 
Catalog No. 1721. 
This series consists of a very well preserved atlas, and the seventh dorsal, 
together with fragments which probably represent the fifth and sixth cervicals. 
These specimens, like the foregoing, belonged to a small individual, evidently quite 
immature, inasmuch as both the anterior and the posterior epiphyses of the centra 
have been lost. 
