A N<irE i)N THK PltKOAVAL SYSTKM OK 

 HYLA CMRULEA, White. 



By C. D. GILLIES, B.Sc. 



Biological Laboratory, University, Brisbane. 

 (Plate VIII.) 



{Read before the Royal Society of Queensland, August \4^th, 



1914.) 



On account of its suitability for dissection, considerable 

 numbers of Hyla ccerulea are used in the Biology Department 

 of the University of Queensland. Most of the text books 

 on the anatomy of the frog (1). (2), (3), (4), describe species 

 of Rana, and H. ccerulea is found to differ in some respects 

 from these. Considerable differences are shewn in the 

 arrangement of the precaval blood vessels, and as this 

 system had apparently not been previously described in 

 H. ccerulea. ]\Ess Freda Bage, M.fSc, while Acting Lecturer 

 in Biology at the University, suggested that I should 

 undertake this investigation. 



A number of frogs were examined, but no ai^preciable 

 rariations amongst the precaval systems of these was 

 observed, and both the right and the left Were found to be 

 similar. 



The precaval is formed by the union of three veins : — 

 A. Lingual. — ^This vein is the most anterior, and runs 



parallel to the long axis of the body, leturning 



blood from the tongue. 



