. The American journal of anatomy. first to consider the anatomyof the postrenal division of the postcavain other marsupials where, so far asknown to the writer, its mode of originis uniform. In a wombat (Phascolomys mitchelU)and a wallaby [Petrogale ()]recently dissected by the writer the post-cava was formed, in each animal,through a union of the Vv. iliacse com-munes (V. i. c. in Text Fig. VI), whichtook place ventral to the arteries. Also,in each animal, between the Truncushypogastricosacralis (T. hs.) and the (A. r.) the postcava was situated in the middle line and ventral
. The American journal of anatomy. first to consider the anatomyof the postrenal division of the postcavain other marsupials where, so far asknown to the writer, its mode of originis uniform. In a wombat (Phascolomys mitchelU)and a wallaby [Petrogale ()]recently dissected by the writer the post-cava was formed, in each animal,through a union of the Vv. iliacse com-munes (V. i. c. in Text Fig. VI), whichtook place ventral to the arteries. Also,in each animal, between the Truncushypogastricosacralis (T. hs.) and the (A. r.) the postcava was situated in the middle line and ventral tothe aorta (Ao.). In Petrogale the Vv, spermaticse internae (V. sp, i,)opened into the postcava, as in Didelphys, slightly caudad of a point mid-May between the Vv. renales (V. r.) and the Vv. iliacse communes(V. i. c). In the wombat, however, the spermatic veins opened into thepostcava slightly caudad of the renal veins. Whether this connection, ^In the wombat the spermatic arteries also arose in the neighborhood of Fig. VI. Postrenal division of thepostcava of Petroyale (). Ven-tral view. , A. iliaca externa; interna; , A. mesenterica;Ao., aorta; , A. renalis; , interna anterior; ,A. spermatica interna posterior; pc,postcava; , Truncus hyp gasrri-cosacralis; , V. iliaca externa;, V. iliaca interna; , V. re-nalis; , V. spermatica interna. Charles F. W. McClure 389 so far craniad, is the usual method in the wombat can only be deter-mined through further investigation. At any rate in Didelphys and othermarsupials thus far examined, including the wombat (Hochstetter, 93),the internal spermatic veins open into thepostcava at about the samelevel as that figured for Pctrogale. In the wombat the renal and spermatic veins anastomose with eachother, on both sides, by means of a vessel which follows the ureter. InDidelphys a similar anastomosis was met mth, and in well injec
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