AN ABNOIIMAI. VERTEBRAL COLUMN L\ 

 HYLA CMRULEA WHITE. 



By C. D. Gillies, M.Sc, and Beatrice B. Taylor, 

 Biology Department, University, Brisbane. 



(With Text-Figure 23). 



{Read before the Royal Society of Queensland^ 

 SQth September, 1918). 



During the course of an osteological examination of a 

 number of specimens of Hyla coerulea White that had been 

 used for class purposes in the Biology Laboratory of the 

 University of Queensland, one was observed to possess a 

 vertebral cohimn which deviated from the normal condition 

 to a very marked degree. Instead of the vertebrae forming 

 the characteristic linear series a pronounced curvature was 

 seen on viewing the column dorsally and ventrally, the 

 abnormality being more apparent from the ventral aspect, 

 while on examining the vertebrae laterally it was observed 

 that the column was directed dorsall}^ from the fourth 

 vertebra to the atlas. Viewing the specimen ventrally, 

 the lateral curvature became apparent in the third vertebra 

 and proceeding posteriori^' to the junction of the fourth 

 and the fifth, the deflection was to the left, but in the fifth 

 and sixth the curvature was to the right bringing the longi- 

 tudinal axis back to the characteristic linear condition in 

 the remaining posterior components of the column. The 

 atlas and second vertebra were also normal in this respect. 



