HADROSAXJRUH. 79 



measured at the side, averages about three inches and a half in length, and below 

 is slightly shorter. In front they measure about thirty-eight lines in height, and 

 forty lines in width. The articular ends have the same outline as in the former 

 specimen. 



The articular convexity of the more anterior pair of specimens. Figs. 5, 6, which 

 are slightly longer than the others, is irregular, presenting the appearance of an 

 expanded mass that has collapsed. In the succeeding pair of specimens. Figs. 7, 8, 

 the articidar convexity is more uniform, and is defined from the lower border of the 

 body by a crescentoid lip prolonged below. The border of the articular concavities, 

 in the four specimens, is bevelled off and prolonged inferiorly. 



The spinal foramen is subcOrdate. In the anterior pair of specimens it is about 

 fifteen lines in height and width ; in the posterior pair about fourteen lines in height 

 and width. 



The articular facet for the head of the rib is observed in the four specimens to 

 rise successively higher on the sides of the vertebral arch, and as in the former 

 specimen described, it is a vertically elliptical concavity. From the relative posi- 

 tion of these articular facets, the four vertebree have been placed in the succession 

 designated, otherwise I should have been induced to place the hinder pair in advance 

 from the more uniform anterior convexity of their body, and their slightly less 

 length. 



In the posterior pair of specimens. Figs. 7, 8, the articular processes of the arch 

 are preserved, and in one of them part of the spinous process. The length of the 

 vertebrae between the anterior and posterior articular processes is five inches and a 

 half. The processes are elliptical planes with their long diameter nearly parallel 

 with the axis of the vertebrae. Those anterior look towards each other with a slight 

 inclination upward ; those posterior of course have an opposite direction. 



A transverse process, on the right side of the specimen, Fig. 7, apparently 

 unbroken, is of robust proportions, extends oiitwardly, backward, and upward, and 

 terminates in a rounded end without enlargement. 



Two posterior dorsal vertebrae, represented in Figs. 9-11, Plate II, have the same 

 general form of body as those just described. It is, however, shorter, but broader 

 and deeper. Thus the smaller of the two specimens has the extreme length of the 

 body at the sides forty-one lines ; the width and depth anteriorly forty-five lines. 

 The larger specimen has its body forty lines long, and four inches wide and deep 

 anteriorly. The sides of the body, as in the preceding vertebrae, are longitudinally 

 concave, and terminate below in a rather sharp saddle-like ridge expanding towards 

 the articular borders. 



The articular ends. Fig. 11, are cordiform in outline, Avith the lateral and inferior 

 borders strongly everted and convex. The posterior end is moderately concave with 

 wide everted margins. The depth of the concavity at its centre is about five lines. 

 The anterior articular end. Fig. 11, presents a crescentoid depressed or sub-concave 

 surface below, including a sub-convex prominence extending from the centre to the 

 upper border of the articular surface. 



The spinal foramen is cordiform, rather wider than high, being about fifteen lines 

 transversely, and thirteen vertically. The abutments of the vertebral arch are 



