356 



M.C 



case in the somewhat similarly abnormal frogs recorded by Wood- 

 land (22) and Hill (8). This of necessity precludes any portal function 

 being attributed to the left kidney, as the whole of the blood supply 

 to this organ must have been derived from the renal arteries. Leaving 



the anterior end of the 

 kidney, the persistent 

 posterior cardinal vein runs 

 forward alongside the left 

 aortic arch to a point 

 above the level of the 

 pre-caval. Here it curves 

 mesially to join the in- 

 nominate which , after 

 receiving the internal 

 jugular and sub-scapular 

 separately, swells out into 

 a bladder-like dilatation 

 before joining the pre- 

 caval. The left renal-portal, 

 which breaks into renae 

 advehentes is reduced in 

 size, and in consequence 

 the corresponding pelvic 

 is large. 



The two kidneys differ 

 in size, that of the right 

 side being longer, broader 

 and slightly thicker, i. e. 

 distinctly larger than that 

 of the left. A very distinct 

 asymmetry is also notice- 

 able in the composition of 

 the inter-renal vein, which 

 receives from the right 

 more branches than from 



Fig. 1. Diagram of Venous System 

 of Specimen A. A.A. Anterior Ab- 

 dominal, B. Brachial, D.A. Dorsal Aorta. 

 D.L. Dorso-lumbar, E.J. External Ju- 

 gular, F. Femoral, I. Innominate, I.J. 

 InternalJugular, I.R. Inter- renal, i. P. 

 Left Posterior Cardinal, M.C. Musculo- 

 cutaneous, P. Pelvic, R.A. Right An- 

 terior Vena Cava, R.R.P. Right Renal 

 Portal, 8. Sciatic, S.C. Sub-clavian, 

 S.S. Sub-scapular, V. Vesicular. 



A. Dorsal surface of right kidney 

 to show the distribution of the renal 

 portal vein. 



the left; and, as has already been noticed, its anterior end traverses 

 the ventral surface of the left kidney to join the posterior cardinal. 



Specimen B. d" Limnodynastes peronii (Fig. 2). 

 In its main outlines the arrangement of the veins in this specimen 

 is similar to the one just described, that is to say the abnormality con- 

 sists in the persistence of the left posterior cardinal which again had 



