The only observations hitherto recorded on the placentation of the Dugong are by Paul Harting, of Utrecht, in 1878, who examined the foetal membranes of a foetus 27.8 cent. long. He stated that the placenta was diffused and non-deciduate.

The gravid uterus described in this communication was presented to the author by C. W. de Vis, Esq., M.A., curator of the Queensland Museum, Brisbane, through Professor Anderson Stuart of the University of Sydney.

The uterus was bicornuate, and contained a single fœtus, 5 feet 4 inches long. The fœtus and its membranes occupied the left cornu, and there was no extension of the membranes into the right cornu.

The chorion was an elongated sac, upwards of 5 feet long from pole to pole.