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Show 408 DR. J. MURIE ON THE EMU. [Api*. 11, which I have had drawn from nature, it will be seen, however, that in the undistended condition of the pouch the margins of the tracheal opening are not widely separated, the trachea itself being more or less uniform in calibre, while the walls of the sac are rather cylindrical than otherwise. Lower portion of the neck of the adult "j? E m u seen in front, displaying the tracheal pouch (T.p. T.p'.) opened and dragged back on either side by hooks. Tbe feathers are cut short at the tips. ap. Aperture or deficiency in the tracheal rings, c. d. s. Cul de sac of left upper end. /. b. f. b'. Fibrous bands which drag outwards the tracheal cartilages during inflation of the sac. Dr. Knox has compared the size of the sac to that of a man's head ; I have found it in the adult female to have the following dimensions when laid open :-Greatest length, taken upon the left side of the trachea, 14| inches; but over the trachea itself it measured only 11 inches. A little pouch or cul de sac (fig. l,c.d. s.) reached upwards on the left side of the trachea for above 3 inches, giving the increased length at this part. This sacculus appears to correspond with a similar dilatation observable in Knox's figure. The |