. 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 . d otheropenings of air-passages leading into theinterior diploic tissue of bones of theskull, and especially into the lower jawbone. The ear-paits are immensely de-vek)ped in ovaIs
. 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 . d otheropenings of air-passages leading into theinterior diploic tissue of bones of theskull, and especially into the lower jawbone. The ear-paits are immensely de-vek)ped in ovaIs, in many species ofwhich they are unsymmetrical, that is,not sized and shaped alike on right andleft sides of the head. The Spheuoid (Gr. (x4)t]v, sphen, awedge; fiSoy, eklos, form; figs. 62, 70,71) is a compound bone, not easy to un-derstand as it occurs in birds, as muchof it is hidden from the outside, some ofit is very slightly developed, and all of itis completely constdidated with surround-ing bones iri the adult. It is wedgedinto the very midst of the cranial bonesproper, with its body in the middle lineFig. 70. - Ripe chicks skull, longitudinal section, viewed helow, next in front of the basioccipital, and its wings spread on either side in theorbital cavity. A sphenoid consists es-sentially of the hasisphenoid, or mainpart of the bone (fig. 62); the alisphe-noids or wings, on either side (figs. 70,. inside, x 3 diameters; after Parker. In the mandible are seen:mk, remains of meckeliau rod; d. dentary bone; sp, sjalenial;a, angular ; sit. surangular; ar. articular; iaj), internal articu-lar process; pap, posterior articular process. In the skull: ptn,the original prenasal cartilage, upon which is moulded the pre-maxillary,})., with its nasal process, npx, and dentary process, : s)i, septo-nasal cartilage, in which is seen nn. nasal nerve; Ji^fc, nasal turbinal ; the reference line crosses the craw (0-/(7cin7 „, n^i i / 7 / \ suture, the face parts and cranial pa
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
