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the ventral surface of that organ it opens into the inter-renal vein 

 without its calibre being reduced. Closer examination show^s that no 

 venae renales advehentes are given off, so that the kindney was 

 devoid of a renal portal blood supply. In the other cases where 

 there has been a conspicuous vessel crossing the ventral surface of 

 the kidney it has been the inter-renal vein running into the 

 persistent posterior cardinal which was directly connected with 

 the renal portal vein of the same side [O'Donoghue (7), Woodland 

 (11)] and not as here the renal portal crossing to join the inter-renal 

 vein. This absence of a portal system in the right kidney necessitated 

 the blood from the right renal portal vein returning to the heart via 

 the left pre-caval vein, a truly remarkable state of affairs. 



Another unusual feature is that the inter-renal vein receives no 

 tributary from the right kidney although those from the left are nor- 

 mal. The blood from the right kidney was carried into the renal 

 portal vein by two vessels, an anterior and a posterior, which enter 

 it on the ventral surface of the kidney just lateral of the supra 

 renal body. 



All other vessels and organs appear to be quite normal, except 

 that the left kidney was considerably larger in volume than its fellow, 

 more so indeed than appears in the diagram. 



Specimen D. $ Rana temporaria (Fig. 3). 



This example is unhke any that have previously been recorded 

 in Rana temporaria cut is somewhat similar to that described in 

 Limnodynastes peronii (7). It is further exceptional in being a full 

 grown female animal. 



The abnormality here encountered consists in the entire absence 

 of the post-caval vein save in its inter-renal portion and in the per- 

 sistence of the left posterior cardinal vein. The persistent cardinal 

 vein in this specimen, unlike the three previous examples, retains its 

 old connection with the vessel (Jacobsons vein) on the lateral wall 

 of the kidney and is in addition also connected with the inter-renal 

 vein by a continuation of this latter joining it a short distance in 

 front of the left kidney. The internal jugular and sub-scapular veins 

 open separately into the innominate portion of the posterior cardinal 

 vein which is not dilated as it is in some of the previous cases. 



The renal portal vein is constituted in the usual manner on both 

 sides and the right renal portal is distributed in a normal manner to 

 the corresponding kidney. The left renal portal vein, however, is 

 continued along the lateral wall of the kidney (i. e. Jacobsons vein) 



