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Summary.

  • 1
    The development of the middle ear is described in Eremitalpa, Elephantulus and Ericulus. The structure in Eremitalpa is fundamentally more primitive and quite distinct from that seen in Ericulus.
  • 2
    The interossicular joints are in some cases clearly incapable of movement.
  • 3
    Evidence is brought forward for the view that the manubrium mallei and the element of Spence represent the insertion and horizontal portions respectively of the reptilian extrastapes,