. A manual of zoology. PHYLUM CHORDATA 463 out at right angles to the trunk, twenty-three large feathers (f'g- 273) are seen to spring from its hinder or post-axial border : these are the remiges or wing-quills. Twelve of them are connected with the ulna and are called cubitals or secondaries (cb. rmg). The rest are known as primaries. In the tail there are twelve long rectrices ( ret) or tail-quills springing in a semicircle from the uropygium. The whole feather-arrangement is known as thepterylosis. t. ~:t>3. car Fig. 276. — Columba livia. The bones of the trunk, acr. cor, acrocoracoid; a
. A manual of zoology. PHYLUM CHORDATA 463 out at right angles to the trunk, twenty-three large feathers (f'g- 273) are seen to spring from its hinder or post-axial border : these are the remiges or wing-quills. Twelve of them are connected with the ulna and are called cubitals or secondaries (cb. rmg). The rest are known as primaries. In the tail there are twelve long rectrices ( ret) or tail-quills springing in a semicircle from the uropygium. The whole feather-arrangement is known as thepterylosis. t. ~:t>3. car Fig. 276. — Columba livia. The bones of the trunk, acr. cor, acrocoracoid; a. ir, anti-trochanter; aclb, acetabulum; car, carina sterni; cd. v, caudal verte- brae; cor, coracoid; C7'. r, cervical ribs:y trs, probe passed into foramen triossenm; fur, furcula; gl. cz', glenoid cavity; il, ilium", is, ischium; , ischiatic foramen; obt. n, obturator notch; pic, pubis; pyg. st, pygostyle; scp. scapula; s. scr, svn-sacrum; st, sternum; st. r, sternal ribs; th. v. 1, first, and th. v. 5, last thoracic vertebra; ltnc, uncinates; vr. r, vertebral ribs. The vertebral column is distinguished from that of most other Craniata by the great length and extreme mobility of the neck, the rigidity of the trunk region, and the shortness of the tail. There are fourteen cervical vertebrae, the last two of which have double-headed ribs (Fig. 276, cv. r) each. 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; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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