. Odontornithes: a monograph on the extinct toothed birds of North America; with thirty-four plates and forty woodcuts . in specimen number1734. It is here broadest just below the middle, where the upperedge becomes thin, and somewhat expanded. Beyond the middle, thebone tapers to near the distal end, and the extremity is rounded. Thescapula decreases pretty regularly in thickness from near the proximal tothe distal extremity, where it becomes thin and blade-like. The following nieasureinents indicate the size of the scapula inIchthyornis and Apatornis. SHOULDER-GIRDLE OF ICHTHYORNIS. 143 Meas
. Odontornithes: a monograph on the extinct toothed birds of North America; with thirty-four plates and forty woodcuts . in specimen number1734. It is here broadest just below the middle, where the upperedge becomes thin, and somewhat expanded. Beyond the middle, thebone tapers to near the distal end, and the extremity is rounded. Thescapula decreases pretty regularly in thickness from near the proximal tothe distal extremity, where it becomes thin and blade-like. The following nieasureinents indicate the size of the scapula inIchthyornis and Apatornis. SHOULDER-GIRDLE OF ICHTHYORNIS. 143 Measurements of Scapula. {Ichthyornis dispar, No. 171S.) Greatest diameter, across humeral articulation, --. Least diameter, through humeral articulation, Length of acromial process, from base, Measurements of Scapula. (Ichthyornis victor, No. 1452.) Greatest diameter, across humeral articulation, 8. mm Least diameter, through humeral articulation, - 3. Length of acromial process, , - — The various bones in the scapular arch of Ichthyornis are shown inposition in the fig-ure below. Pig. Figcee 31.—Scapular arch of Ichthyornis victor, Marsh; twice natural size. s. scapula; c. coracoid; cl. clavicle ,st. sternum; k. keel of sternum; sr. costal border; g glenoid fossa. 144 ODOXTORNITHES. Measurements of Scapula. (Apatomisceler, No. 1734.) Left. Right. Length of scapula, -- Greatest diameter, across humeral articulation, 5. lmm Least diameter, through humeral articulation, 2. Length of acromial process, from base, Diameter of shaft, above humeral articulation, 3. 3. The Coracoid. (Plate XXIII and XXIX.) In the genus Ichthyomis,. the coracoid is a strong bone, much widenedat the proximal end, where it articulates with the sternum in an elongatedgroove on each side. These grooves, and consequently the coracoids intheir natural position, cross the median line in front in such a mannerthat the right coracoid is external to, or in front of, the
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Keywords: ., bookcentury1800, bookdecade1880, bookpub, booksubjectpaleontology
