. Journal de l'anatomie . e fissure, qui se termine en asmall ouverture libre juste en dessous du niveau des pochettes 4tli. En raison de cette disposition des masses latérales, la ligne de l'openingdans la future cavité laryngée peut être décrite comme y-forme, tlie limbsde la y ayant entre eux la partie inférieure de la proéminence médiane,sur laquelle une courte, légèrement marquée rainure est vu, représentant la fin supérieure de la fissure d'origine. VOL XLIV. (Troisième SEK. VOL. V.)—JAN. 1910. 11 160 M. J. Ernest Frazer V. (12 mm., tig. 5).—les poches latérales sont seulement perceptibles. Lacavité générale étroite

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. Journal of anatomy . e fissure, which terminates in asmall free opening just below the level of the 4tli pouches. Owing to this disposition of the lateral masses, the line of the openinginto the future laryngeal cavity can be described as Y-shaped, tlie limbsof the Y having between them the lower part of the median prominence, on which a short, slightly marked groove is seen, representing the uppertermination of the original fissure. VOL XLIV. (third SEK. VOL. V.)—JAN. 1910. 11 160 Mr J. Ernest Frazer V. (12 mm., tig. 5).—The lateral pouches are only just discernible. Thegeneral cavity narrows rapidly internal to and behind the 2nd pouch, the side wall passing almost directly inwards, but over the middle of the3rd arch the line of the wall passes more directly backwards with a slightinclination inwards, past the 3rd and 4th pouches, to narrow again rapidlybelow this. The arches are distinguishable, the 3rd small and apparently runninginto the front part only of the mesial mass. Behind this the laryngeal. Fig. 4. A. Reconstruction model : embryo 8 5 mm. B. Surface view of laryngeal opening of same seen somewhat from the side, showing the lateral masses commencing to overlap the central mass: the 3rd and 4th pouches are seen at the side. surface swellings stand altogether above the level of the 4th pouches, thelateral masses being smooth and prominent, and much thicker than in thepreceding model: their upper ends are broad and thick, and seem to becontinuous with the sides of the upper part of the central mass, above thelevel of the 3rd pouches. The central mass is rounded and broader for itsheight than in the previous model, so that the limits of the Y-shapedopening are more divergent. VI. (1(3 mm., fig. 6).—There are no indications of separate arches orclefts, save the lower ends of the Eustachian pouches. The epiglottic, isdistinct, separated by a sulcus from the back of the growing tongue. The The Development of the Larynx 161 lateral masses are much more pr

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