168 VERTEBRAL COLUMN IN HYLA CiERULEA WHITE. 



was normal but the left bore the articular surface on the 

 dorsal aspect causing it to be overlapped by the associated 

 j)rezygapophysis. Ventrally it was seen that the centrum 

 was displaced to the right. The diapophysis of this side 

 was very reduced and was undoubtedly the smallest trans- 

 verse process of the entire series, though probably it was 

 slightly damaged. The diapophysis of the left side was 

 typical but for the fact that it approached the horizontal 

 rather closer than is usually the case. 



Fifth vertebra. Viewed dorsally, it was seen that the 

 zygapophyses of the right side were better developed than 

 those of the left ; furthermore the prezygapophysis of the 

 latter was abnormal in bearing the articular surface on its 

 ventral aspect. The left disapophysis was dilated distally, 

 and was stouter and someAvhat longer than the one on the 

 right. 



Sixth vertebra. This vertebra was almost normal. The 

 centrum, when viewed from the ventral surface, was curved 

 to the left to a slight extent and the left diapophysis was 

 more slender than the right, which was directed anteriorly 

 instead of being more or less horizontal. 



Seventh vertebra. The right diapophj'sis (vertebra 

 viewed dorsally) was stouter than the process on the left. 



Eighth vertebra. The neural arch was remarkable owing 

 to the absence of a right posterior zygapophj^sis, but the 

 one on the left was normal. Viewed dorsally the diapophysis 

 of the right was dilated in the manner characteristic of a 

 normal ninth vertebra, hence on this side forward homcesis 

 was exhibited. The left transverse process was normal 

 but instead of making a greater angle with the horizontal 

 than the corresponding process of the seventh the angle 

 present was actually less. 



Sacral vertebra and urostyle. The last component of the 

 vertebral column was compound and evidenth' formed, by 

 the fusion of the ninth or sacral with the urostyle, the union 

 being so complete that it was impossible to determine the 

 line of demarcation between them. The tj^Dical dilatation 

 of the diapophyses was only apparent on the right transverse 

 process (dorsal view), but the latter was slightlj- smaller 



