Frank E. Beddard, Cambridge Natural History Mammalia (1902)
“ There is still the slight projection upon the premaxillary bones, but the nostril is directed more forwards than in Toxodon. The zygoma, too, is massive. The second pair of incisors in the upper jaw and the outer (third) pair in the lower jaw form biggish tusks in the adult. These and the molar teeth are, however, finally rooted, and do not grow, as in Toxodon, from persistent pulps. The genus is from the older Tertiary of Patagonia. Five or six species have been described. Some are as large as a Rhinoceros, others as small as a Sheep. ”
