. Elementary text-book of zoology [electronic resource]. Zoology. 372 CHORD AT A. half-way along its ventral border. Posterior to it is a triangular ischium^ with a large oval foramen (the ischiatic foramen) in it. From its anterior border there runs back- wards beside the edge of the ischium a long pubis. There is no symphysis. Just above, and posterior to the acetabulum is a small facet, the antitrochanter which articulates with the trochanter of the femur. The hind limb has a short femtir, a small and vestigial fibula, but a large tibia to which are fused the proximal tarsal bones, hence it
. Elementary text-book of zoology [electronic resource]. Zoology. 372 CHORD AT A. half-way along its ventral border. Posterior to it is a triangular ischium^ with a large oval foramen (the ischiatic foramen) in it. From its anterior border there runs back- wards beside the edge of the ischium a long pubis. There is no symphysis. Just above, and posterior to the acetabulum is a small facet, the antitrochanter which articulates with the trochanter of the femur. The hind limb has a short femtir, a small and vestigial fibula, but a large tibia to which are fused the proximal tarsal bones, hence it is known as the tibio-tarsus. This is followed by another compound bone which consists of the distal tarsals and three metatarsals, hence it is known as the iarso-metatarsus. It forks into three processes at its distal end, each of which bears a digit. A small bone on its inner side is the first metatarsal, which bears the first digit. The number of phalanges increases outwards from two to five. In the hind limb there can be recognised the same two features as in the front limb, , the reduction in the number of digits and the fusion of tarsals and meta-tarsals. In the hind limb there is, however, a further fusion of the proximal tarsals to the tibia. The foot moves in the birds upon an inter-tarsal joint, the movement being between the two rows of tarsals. Fig. 258. —Diagram of a Fowl's Egg at CH., Chalaza. Alb., Albumen. ShM., Shell Membrane. A., Air-chamber. BL., Blastoderm. Sh., Shell. ¥., Yolk. "^^Development [Galhis).—The true egg of the fowl is a large yellow sphere enclosed in a delicate vitelline membrane. It is usually termed the "yolk" of an "; It is fertilised at the top of the Fallopian tube and passes slowly down the oviduct, developing as it goes, so that a laid "egg" has already developed for about eighteen hours. As it. Please note that these images are extracted from scanned page images that may have bee
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
