BY C. D. GILLIES, B.SC. 67 



possession in both forms of a branch from the skin, running 

 into the mandibular vein at the angle of the jaw. The 

 points of difference may l)e tabulated as follows : — 



The presence of the somatic vein in H. ccerulea and its 

 absence in H. aurea is an important difference. 



My thanks are due to Miss Freda Bage, M..Sc.. and 

 Dr. T. Harvev Johnston for their kind assistance. 



BIBLIOGRAPHY. 



(1) Marshall, "The Frog." 



(2) Parker and Haswell, " Textbook of Zoology," Vol. II. 

 (o ) Thomson, " Outlines of Zoology." 



(4) Wells and Da vies, " A Textbook of Zoology." 



(;")) Sweet, G., Proc. Roy. Soc, Victoria, XXL, 1908, p. 349. 



PLATE VIII. 



Fig. !. — Sketcl^ of a dissection of Hyla ccerulea from the ventral turface, 

 shewing the precaval system. 



Fig. 2. — Diagrammatic representation of the jnecaval system of Hyla 

 ccerulea. 



