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Show 956 MR. W. H. FLOWER ON HYOMOSCHUS AQUATICUS. [Dec. 12, articular surface for the corresponding arytenoid cartilage. The lower border has a long pointed median prolongation. From each side stands out a short triangular process for articulation with the lateral processes of the thyroid; and from the same part descends, very obliquely downwards and forwards, a long, rather slender prolongation of the cartilage, which, meeting its fellow in the middle line in front, completes the ring. Fig. 1. Side view of larynx of Hyomoschus aquaticus. Nat. size. a. Thyroid cartilage, b. Cricoid cartilage, c. Arytenoid cartilage, d. Epiglottis, e. Thyrohyal. /. Basihyal. g. Stylohyal. The arytenoid cartilages (c) are flattened plates almost quadrilateral in figure, yj inch in diameter; the aryteno-epiglottidean ligament is attached to the middle of their upper margin, the thyro-arytenoid ligament (vocal cord) to the antero-inferior angle; and they are articulated to the cricoid cartilage by their posterior inferior angle. The cavity in the interior of the larynx may be divided into two parts-a direct uninterrupted passage to the trachea posteriorly, and in front of this a capacious but laterally compressed pouch or diverticulum, situated within the expanded thyroid cartilage. Owing to |