Skulls of Ceratotherium simum simum illustrating subspecific character of greater dorsal elevation of lambdoidal crests. The specimen is an old female from South Africa, kept in the department of paleontology at the American Museum of Natural History. Plate 18 in Heller, E., 1913. The white rhinoceros. Smithsonian Miscellaneous Collection 61 (1): i, 1-56
