. An elementary course of practical zoology. Zoology. 46 THE FROG chap. head, the latter firmly fixed to the inner face of the tym- panic membrane. The inner end of the handle is tipped with cartilage, and is attached to a small cartilaginous nodule, the stapes (si), which is inserted into an aperture in the auditory capsule known as the fenestra ovalis {fen. ov). With care the columella can easily be removed with small forceps, in a wet skull, and examined under a magnifying glass. The shoulder-girdle has the form of an inverted arch encircling the anterior region of the trunk, and having its
. An elementary course of practical zoology. Zoology. 46 THE FROG chap. head, the latter firmly fixed to the inner face of the tym- panic membrane. The inner end of the handle is tipped with cartilage, and is attached to a small cartilaginous nodule, the stapes (si), which is inserted into an aperture in the auditory capsule known as the fenestra ovalis {fen. ov). With care the columella can easily be removed with small forceps, in a wet skull, and examined under a magnifying glass. The shoulder-girdle has the form of an inverted arch encircling the anterior region of the trunk, and having its dorsal ends turned inwards so as partly to cover the second to the fourth vertebrae (Figs. 8 and ii). The dorsal region, Fig. II.—Diagrammatic transverse section through the shoulder-girdle. coy, coracoid ; ep. cor. epicoracoid ; gL glenoid cavity ; hu. humerus ; scp. scapula ; J. scp. supra-scapula ; v. 3^ third vertebra. on each side, is formed by a broad plate, the supra-scapula is. scp), or upper blade-bone. It is mostly formed of bone, but its free edge consists of cartilage which, when dried, is seen to be impregnated with a granular deposit of lime-salts. This rough, brittle tissue is called calcified cartilage, and is distinguishable from true bone, which has usually a smooth, enamelled surface. Connected with the ventral end of the supra-scapula and passing vertically downwards is a flat bone, broadened at each end, the scapula or blade-bone (Fig. it, scp: Fig. 12, S).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
