In August 1892, a year later, Dubois's team found a long femur (thighbone) shaped like a human one, suggesting that its owner had stood upright. The femur bone was found 50 feet (approx. 15 meters) from the original find one year earlier. Believing that the three fossils belonged to a single individual, "probably a very aged female", Dubois renamed the specimen "Anthropopithecus erectus". Only in late 1892, when he determined that the cranium measured about , did Dubois consider that his specimen was a transitional form between apes and humans. In 1894, he thus renamed it "Pithecanthropus erectus" ("upright ape-man"), borrowing the genus name "Pithecanthropus" from Ernst Haeckel, who had coined it a few years earlier to refer to a supposed "missing link" between apes and humans. This specimen has also been known as Pithecanthropus 1.