from a single centre, its identification with ischium depends on the fact that it serves for the attachment of certain muscles connected with the rudimentary femur. Beddard, on the other hand, following Delages, suggests that this single bone really represents the typical three bones of normal mammals united, for, he says, “there is a forward process suggesting the ilium, and a downward process, the pubis, and a slight hollow in the middle suggesting an acetabulum with which in Balaena mysticetus the rudimentary femur articulates.” The pelvis of Kekenodon certainly resembles that of the Mystacocetes in being three-rayed; ef. von Haast (1883), who figures the pelvis of Balaenoptera australis (-physalus. Linn.). Locality: Wharekuri, in the Valley of the River Waitaki (Oligocene). Bibliography. Beddard, F.E., The Book of Whales. Benham, W. B., 1936. The Teeth of an Extinct Whale, Microcetus hectori Benham, Trans. Roy. Soc. N.Z., vol. 65, p. 239. Flower, W., 1876. Osteology of the Mammalia, Macmillian. — 1867. On the Osteology of the Cachalot or Sperm Whale (Physeter macrocephalus), Trans. Zool. Soc., vol. 6, p. 364. Hall, T. S., 1911. On the Systematic Position of the Species of Squalodon and Zeuglodon described from Australia and New Zealand, Proc. Roy. Soc. Victoria (n.s.), vol. 23, p. 258. Hamilton, A., 1903. Notes on a small Collection of Fossils, etc., Trans. N.Z. Inst., vol. 36, p. 465. Hector, J., 1881. Notes on N.Z. Cetacea, Recent and Fossil, Trans. N.Z. Inst., vol. 13, p. 435. Kellogg, R., 1923. Description of Two Squalodonts, etc., Proc. N.S. Nat. Muse., vol. 62, art. 16. Mckay, A., 1881. Report of Geological Survey, p. 68. Park, J., 1904. On the Marine Tertiaries of Otago and Canterbury, Trans. N.Z. Inst., vol. 37, p. 489. Von Haast, J., 1883. Notes on a Skeleton of Balaenoptera austrails Desmulins, Proc. Zool. Soc., p. 592.