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Show 92 PROF. W. B. BENHAM ON THE [Feb. 7, blunt spines, of irregular size, small and large, more or less alternately arranged. At each end of this transverse row of preglottidean spines the ridge bends sharply downwards vertically, and then curves inwards towards the middle line; it here carries a series of seven similar, but larger, conical papilla?, arranged one above the other, decreasing in size ventrally and ultimately dying out. The glottis (gl.) appears to be provided with a rudimentary " epiglottis " (a) in the form of a small rounded nodule of cartilage. Bebind the glottis there is on each side a very obliquely placed ridge, carrying a row of about a dozen small postglottidean papilla? (b), of which the mediad is the largest. Behind this large papilla is a longitudinal series of postglottidean spines or papilla? of the same character but longer and softer (see fig. 2, B ) , Avhich are directed backwards, each spine lying above the succeeding one. These are in three TOAVS, a median and two lateral rows. The median row consists of five papilla?; the lateral rows are unsymmetrical, there being on the rigbt tAATo couples and two single papilla?, on the left five couples. (c) The Larynx (fig. 3) is imperfectly ossified and suggests, The skeleton of the larynx of Notornis (enlarged). A, ventral view ; B, side view ; C, dorsal view : a, the so-called " thyroid "; b, its posterior incurved portion ; c, arytenoid ; c', its mediad limb supporting the margin of the glottis ; d, " cricoid." In C the details of the right side are put in for the sake of symmetry ; as a matter of fact, I dissected only the left side : the right arytenoid is represented as being cut short so as to show more of the cricoid. The tracheal rings are only diagrainmatically indicated, their overlap being omitted. Cartilage is dotted. |