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Show 142 MR. A. D. BARTLETT ON THE [Feb. 25, to represent the so-called stylo-hyoideus is here, as in many other birds, divisible into three portions. The posterior is a broad but thin layer; this as it diverges from the common cranial origin proceeds backwards and downwards, and intermingling along with the platysma they both pass round and in front of the gular pouch. The middle one, also broad and thin, passes over the upper or deep surface of the pouch. The third division, long, narrow, and roundish, runs forwards to the tongue. This triparte but singly named muscle may, indeed, be representative of the stylo-hyoid, stylo-pharyngeus, and stylo-glossus. Besides these, a broadish band of very delicate but transversely striped fibres mingling with the tissue of the neck of the pouch itself surrounds it; this I take to be part of the superior constrictor of the pharynx, which encircles the invaginated duplicature of the sublingual or sublaryngeal membrane differentiated into gular pouch during later life in the male Bustards. The gular pouch, in fact, appears to me but an infolding of the membrane below the upper larynx, developed to a large size in male Bustards only after they attain ripe or old age. This view, therefore, accounts for its absence in the young, [its moderate size in adult, and its increased capaciousness in old birds. The present note serves to show : - 1 . That the gular aperture is rather sublaryngeal than sublingual. 2. That in a bird six years old it has only reached a very moderate size, compared with what it ultimately attains, according to several observers. 3. That there is good reason for believing in the so-called sphincter of the pouch, but that this is merely a lesser or greater development of the fibres of the superior constrictor of the pharynx and stylo-pharyngeus, and not a specialized structure alone adapted for the office it here subserves. * 3. Remarks upon the Habits of the Hornbills (Buceros). B y A. D. B A R T L E T T , Superintendent of the Society's Gardens. A few weeks after the Wrinkled Hornbill (Buceros corrugatus) was received in the Society's Gardens*, the keeper called m y attention to a queer-looking fig-like substance he had picked up in the aviary. Struck with its appearance, I took it home and endeavoured to examine it carefully, and opened its closely folded mouth. I found this fig-like bag contained plums or grapes well packed together, the wrapper or envelope looking much like the inner lining of a gizzard, somewhat tough, elastic, and gelatinous. Almost alarmed for the safety of the bird that had thrown it up, and at the same time having some doubt as to its real nature, I at once sought the assistance of our Prosector, Dr. Murie, handing him the specimen and telling him its history. Dr. Murie's report was as follows :- " O n examination of the specimen I found, as was at first suggested in joke, that the bag did absolutely consist of nothing else * The specimen was purchased March 27, 1868. |