Final answer:
In the western Torres Strait, turtle-shell masks were reportedly used for both funerary ceremonies and increase rites, playing a significant role in ritualistic practices.
Step-by-step explanation:
Masks have been intricately woven into ceremonial and spiritual roles across various cultures. For instance, the False face mask was utilized in ceremonial and healing contexts, with specific mask designs catering to particular illnesses and spirits. As in many other cultures, masks in the western Torres Strait were used for ritualistic purposes. In the context of the Torres Strait, turtle-shell masks were integral to both funerary ceremonies and increase rites. These rites are often tied to indigenous beliefs, encompassing aspects such as respecting ancestors, connecting to the spirit world, and ensuring the well-being of the community through ceremonial practices. Hence, the use of turtle-shell masks is most accurately described as serving a dual purpose of honoring the deceased in funerary ceremonies and promoting prosperity and fertility through increase rites.