Lyncina lynx is quite common. The shells of these cowries are very variabile in pattern and size. They reach on average 38–50 millimetres (1.5–2.0 in) of length, with a minimum size of 18 millimetres (0.71 in) and a maximum size of 90 millimetres (3.5 in). The dorsum surface of these smooth and shiny shells is generally pale brown, pale purple or grey, densely covered with small and large dark brown or purple dots. The large spots are extended to the edges. The base is white or pale brown. The aperture is long and narrow, with several white teeth and a bright reddish spacing. In the living cowries the mantle is transparent, with tree-shaped white sensorial papillae and may cover the entire shell.
This species occurs in the Red Sea, in the Indian Ocean along South-East Africa (Aldabra, Chagos, Kenya, Madagascar, the Mascarene Basin, Mauritius, Réunion, the Seychelles, Zanzibar and Tanzania) and in the western Pacific Ocean (Philippines, Japan, Taiwan, western and northern Australia, Polynesia and Hawaii).