. A manual of zoology. 460 MANUAL OF ZOOLOGY Each digit of the foot is terminated by a claw which is also a horny product of the epidermis, and the beaks are of the same nature. The rest of the body, however, is covered by feathers, a unique type of epidermal product found nowhere outside the present class. rcJi. Fig. 274. — Columba livia. A, proximal portion of a remex. ca/, calamus; z'ttf. limb, inferior umbilicus; rch, rachis; sup. utnb, superior umbilicus. B, filo- plume. C, nestling-down. (C, from Bronn's TliierrcicJt.) A feather (Fig. 274) is an elongated structure consisting o
. A manual of zoology. 460 MANUAL OF ZOOLOGY Each digit of the foot is terminated by a claw which is also a horny product of the epidermis, and the beaks are of the same nature. The rest of the body, however, is covered by feathers, a unique type of epidermal product found nowhere outside the present class. rcJi. Fig. 274. — Columba livia. A, proximal portion of a remex. ca/, calamus; z'ttf. limb, inferior umbilicus; rch, rachis; sup. utnb, superior umbilicus. B, filo- plume. C, nestling-down. (C, from Bronn's TliierrcicJt.) A feather (Fig. 274) is an elongated structure consisting of a hollow stalk, the calamus or quill (cal), and an ex- panded distal portion, the vexillum or vane. At the proximal end of the quill is a small aperture, the inferior umbilicus {inf. umb), into which fits, in the entire bird, a. 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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