Abstract
1. 1. Dissection showed the presence of a testicular rete mirabile in the Tasmanian Devil, Sarcophilus harrisii (Boitard). Serial sections revealed that 3–15 arteries, 13–26 veins and 4–14 lymph vessels formed the rete. 2. 2. Thermistors were used to determine temperatures and the results showed that testicular and body temperature were similar. 3. 3. Similar results were obtained in Potorous tridactylus, Trichosurus vulpecula and Isoodon obesulus. 4. 4. Further experiments indicated that the temperature of the testicular vein is less than body temperature and that the testis temperature falls following testicular surgery but recovers later. 5. 5. It is shown that in contradistinction to the pampiniform plexus of the Eutheria, the marsupial rete is not thermoregulatory in function.
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