Again assisted by convict laborers and two army sergeants, Dubois began searching along the Solo River near Trinil in August 1891. His team soon excavated a molar (Trinil 1) and a skullcap (Trinil 2). Its characteristics were a long cranium with a sagittal keel and heavy browridge. Dubois first gave them the name "Anthropopithecus" ("man-ape"), as the chimpanzee was sometimes known at the time. He chose this name because a similar tooth found in the Siwalik Hills in India in 1878 had been named "Anthropopithecus", and because Dubois first assessed the cranium to have been about , closer to apes than to humans.