222 MEMOIRS OF THE CARNEGIE MUSEUM 
cal with that which has been described in the preceding vertebra, and is well 
shown in the illustration, Fig. 13. 
MEASUREMENTS OF SECOND DoRSAL VERTEBRA. 
Antero-posterior diameter of the centrum 
Transverse diameter of the centrum, posteriorly 
Vertical diameter of the centrum, posteriorly 
Transverse diameter at the transverse processes 
i Transverse diameter at the prezygapophyses.... 
Transverse diameter at the postzygapophyses... 
' Height of neural spine.......ccccse cece csccesseeenneeeneseesesersseeeasenssneceseenauenen teeeesensannans teeeeas seeetens 
Third and Fourth Vertebre.— The third and fourth 
dorsals have their centra similar to that of the second. 
The transverse processes are lighter, the prezygapophyses 
are less complicated, facing directly upward,and the 
neural spines are less expanded at the top than in the 
preceding vertebra; there are otherwise no characters 
which require a separate description. 
Fia. 14. Lateral Views of Third 
and Fourth Dorsals of D. superbus. 
4 nat. size. 
MEASUREMENTS oF THIRD AND FourtH DorsaL VERTEBRZ. 
Dee oD, 
Mm. Mm. 
Antero-posterior diameter Of CONbTA...........scesceeeeeseceeeseecceceeeenaeseeneeeteeaaeceton sraeeraneeeeseeee 23 25 
Transverse diameter of centra 23 
Vertical diameter of centra We 
i Transverse diameter at transverse processes 44 
l ‘ Transverse diameter at prezygapophyses 21 
E Transyerse diameter at postzygapophyses 
vO" 56 
Height of neural spine approximately 
Fifth, Siath, Seventh, Highth, and Ninth Dorsal Vertebre. 
{ — This series of dorsals are so similar to one another that 
they do not each require a separate description. ‘The cen- 
tra are quite uniformly concave on the sides and have a 
a ventral keel more or less indicated, while the individual in- 
crease in the antero-posterior diameter from the fifth to the 
ninth is hardly perceptible. The articular surfaces for the 
ribs are large and the intervertebral notches are low but — pig 15. Ninth Dorsal of 
' of considerable antero-posterior dimensions. ‘The transverse D. superbus. } nat. size. 
