THE ANATOMY OF HYLA CMRULEA WHITE. 



I. — The Pectoral Girdle and Vertebral Column. 



By C. D. Gillies, M.Sc, and Edna F. Peberdy, B.Sc, 



Biology Department, The University of 



Queensland. 



(With Ten Text Figures). 



{Read before the Royal Society of Queensland, 30th April, 



1917). 



The Pectoral Girdle. 



The pectoral girdle of Hyla ccerulea White, is 

 described and figured by W. K. Parker* under the name 

 Catamites cyanea Fitzinger. In the specimens examined 

 by us we found that they exhibited a number of features 

 differing from Parker's work. F. E. Beddard (1) states 

 that it is probable that some of the species described by 

 Parker in his '' Monograph " have been incorrectly 

 identified. The acceptance of this view ma}^ explain the 

 differences observed by us. 



The pectoral girdle of Hyla ccerulea White (Fig. 1) 

 is of the Arciferous type, in which the epicoracoids are not 

 united in the mid-line ventrally, and the right portion 

 of the girdle overlaps the left, when the girdle is examined 

 from the ventral surface. Out of twenty-three specimens, 

 four were abnormal in having the left portion of the 

 girdle overlapping the right. This means that the 

 frequenc}^ of the occurrence of the abnormality is about 

 17 per cent, in tliis particular case. We are of the opinion, 

 however, that this percentage is rather higher than the 

 average. 



*" MoDOgi-aph of the Shoulder Girdle," p. 76, pi. vii., fig. 6. 



