28 MEMOIRS OF THE CARNEGIE MUSEUM 
entire length, forming a long bony plate. The union between the fourth and fifth 
is limited to the extremities while medially they are separated by an elongated 
foramen. In H. priscus only the spines of the three anterior sacrals are codéssified, 
those of the first and second sacrals remaining free. This difference exists notwith- 
standing that the type of the present species was scarcely adult, the sacral centra 
neither being codssified with one another nor with their neural arches. By some 
this character might be considered as of generic importance although I prefer to 
consider it as of only specific value since in all other parts of the skeleton preserved 
there are no distinguishing characters which could be considered as of generic value. 
DEscRIPTION oF THE Typr. (No. 879.) 
The type of the present species consists of a left scapula and right coracoid, 
several ribs and thirty-five more or less complete vertebree distributed as follows : 
Ten ceryicals, thirteen dorsals, five sacrals and seven caudals. For the most part 
these vertebrae are complete, but in a few instances they are represented only by 
isolated spines and neural arches without centra, or by centra without spines and 
neural arches, and one anterior cervical, probably the axis or the succeeding cervical, 
is represented only by a portion of the neural arch. The position of these bones 
relative to one another as they were found in the quarry is shown within the dotted 
line in the upper left-hand corner of the diagram shown in Fig. 1 where the positions 
of the different bones are indicated as follows : . 
1 = cervical 3, placing the number of cervicals at fifteen. 
i SoA 
Se Gs, 
Mies 1. US 
Fos 6 NO, 
6 and 6’ = RRA 
ih) Fok sores 
8= Tamia iss 
Qa Cale 
10) = ‘““ 15, or last of cervical series. 
11 and 11’ = dorsal 2. 
IDS SB 
3; eye! BY 7 SE 
(4) gyno! 4 
15 and 15’ = 
loa & 
o> 
AI 
