. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds. Birds; Birds. the exoceipital (teo). This trowel of cartilage is the upper anterior segment of the hyoidean (second post-oral) arch, being to that arch what the pterygo-palatine bar
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds. Birds; Birds. the exoceipital (teo). This trowel of cartilage is the upper anterior segment of the hyoidean (second post-oral) arch, being to that arch what the pterygo-palatine bar is to the mandibular (first post-oral) arch. Several parts of this stapedial cartilage are recognized, as named in the fine print under the figure. If the connections of the second post-oral arch were completed, as those of the first are, the tongue bone would be slung to the skull as the lower jaw is; but they are not, the tract rep- resented by the dot-line fi:om the stylo-hyal, sth, to the cerato-hyal, ehy, being, like ist, above sth, only soft connective tissue. This defect of connection is made up for by the great development of the hyoidean parts of the third post-oral arch, br 1 and br 2, which retain the tongue-bone in position, without however articulating it with the skuU. The hand of the trowel of cartilage soon segments itself ofi' from the ear-cap- sule, bringing away with it a small oval piece of the periotic wall, which piece is the true stapes, and the oval space in which it fits is the fenestra ovalis leading into the inmost ear (the cochlea). The broad part of the trowel-blade is the extra-stapedial part, on which the membra/na tympa/ni, or ear-drum, will be stretched. The stylo-hyal, sth, will join the extra-stapedial plate, and the afterward chondrified band of union wiH be the infra-stapedial, ist. (Figs. 71, st, and 83.) Returning cca^fh~~/'l. now to the chick's head, which we left to examine the intricate ear - parts at the proximal end of the second pos
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
