From Wikipedia's Ennead article:
Creation-myth
From the primeval waters represented by Nun, a mound appeared. Upon the mound sat Atum who had begotten himself. Bored and alone, he masturbated — some think the myth actually states he committed autofellatio —- or (according to other stories) spat, producing air (Shu), and moisture (Tefnut). Shu and Tefnut in turn gave birth to the earth (Geb) and the sky (Nut), who initially engaged in continuous copulation. Shu separated them, lifting Nut into her place in the sky. Nut and Geb produced children: Osiris, Isis, Set, and Nepthys.
From Wikipedia's Ogdoad article:
Egg variant
The original version of the myth has the entity arising from the waters after the interaction as a mound of dirt, the Milky Way, which was deified as Hathor. In the myth an egg was laid upon this mound by a celestial bird. The egg contained Ra. In the original version of this variant, the egg is laid by a cosmic goose (it is not explained where the goose originates). However, after the rise of the cult of Thoth, the egg was said to have been a gift from Thoth, and laid by an Ibis, the bird with which he was associated.
Lotus variant
Later, when Atum had become assimilated into Ra as Atum-Ra, the belief that Atum emerged from a (blue) lotus bud, in the Ennead cosmogeny, was adopted and attached to Ra. The lotus was said to have arisen from the waters after the explosive interaction as a bud, which floated on the surface, and slowly opened its petals to reveal the beetle, Khepri, inside. Khepri, an aspect of Ra representing the rising sun, immediately turns into a weeping boy - Nefertum (young Atum), whose tears form the creatures of the earth. In later Egyptian history, as the god Khepri became totally absorbed into Ra, the lotus was said to have revealed Ra, the boy, straight away, rather than Ra being Khepri temporarily. Sometimes the boy is identified as Horus, although this is due to the merging of the myths of Horus and Ra into the one god Ra-Herakty, later in Egyptian history
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