. A course of instruction in zootomy (vertebrata). Anatomy, Comparative. THE PIGEON. 207 two slightly concave articular surfaces for the condyles of the femur, and is produced in front (dorsally) into a prominent cnemial crest divided into two diverging plates. The distal extremity is pulley-shaped, and its transverse axis is inclined at an angle to that of the proximal extremity: the two condyles of which the distal pulley is formed are more prominent on the anterior (dorsal) than on the posterior face of the bone, thus differing from the very similar condyles of the mtl2 FIG. 51.—Col
. A course of instruction in zootomy (vertebrata). Anatomy, Comparative. THE PIGEON. 207 two slightly concave articular surfaces for the condyles of the femur, and is produced in front (dorsally) into a prominent cnemial crest divided into two diverging plates. The distal extremity is pulley-shaped, and its transverse axis is inclined at an angle to that of the proximal extremity: the two condyles of which the distal pulley is formed are more prominent on the anterior (dorsal) than on the posterior face of the bone, thus differing from the very similar condyles of the mtl2 FIG. 51.—Columba livia. Left tarso-metatarsus of an unhatched embryo, with the distal end of the tibio-tarsus, viewed from the anterior (dorsal) face ( x 5). The tarsal cartilages (, ) are represented as separated from the tibia and metatarsus respectively. The cartilaginous parts are dotted. m'., second, , third, and mtl.^, fourth metatarsal : ti, tibia : //.I, proximal tarsal cartilage, afterwards fusing with tibia : , distal tarsal cartilage, afterwards fusing with metatarsus. 114. In a pigeon embryo towards the end of incubation, the distal end of the tibio-tarsus is a separate cartilage, the proximal tarsal cartilage (Fig. 51, //.i) : its separateness in the cartilaginous state distinguishes it from an epiphysis, which is a distinct ossification in a continuous 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. London, Macmillan
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