d. Australopithecus -- Donald Johanson in his book "Lucy" refers to the "australopithecine mess" - and it definitely is that. The very word Australopithecus means "southern ape" because the first fossils were found in South Africa. The discoverer was Dr. Raymond Dart, professor of anatomy at Witwatersrand University in Johannesburg.
Dart was convinced that some teeth were man-like and thus concluded it represented a transitional between apes and man. His opinions on the matter were largely scorned by the scientists of his time (1924) who considered it nothing more than a chimpanzee. The skull was soon known derisively as "Dart's baby". Perhaps no one has studied the australopithecenes more than Sir Solly Zuckerman who wrote: "Evolution as a Process" in 1954: "There is indeed no question which the australopithecine skull resembles when placed side by side with specimens of humans and living ape skulls. It is the ape-so much so that only detailed and close scrutiny can reveal any difference between modern ape and Australopithecus."