. The structure and life of birds . IL --W- ~D^V. Fig. 8.—Left side of Pelvis (a) of Lizard ; (/>) of Bird. A, acetabulum ; 11., ilium ; is, ischium ; PB, pubis ; v, vertebrae fused. In (a) the ischium and pubis slope inwards to meet their fellows from the opposite side. In (/>) all three bones are fused where they meet. The ilium extends forwards as well as backwards from the acetabulum. Pubis proper, or whether a pubic process hasbeen added, would be out of place. The termprocess, meaning an out-growth, is a favourite onewith anatomists, and is often useful as a name,though, it must be
. The structure and life of birds . IL --W- ~D^V. Fig. 8.—Left side of Pelvis (a) of Lizard ; (/>) of Bird. A, acetabulum ; 11., ilium ; is, ischium ; PB, pubis ; v, vertebrae fused. In (a) the ischium and pubis slope inwards to meet their fellows from the opposite side. In (/>) all three bones are fused where they meet. The ilium extends forwards as well as backwards from the acetabulum. Pubis proper, or whether a pubic process hasbeen added, would be out of place. The termprocess, meaning an out-growth, is a favourite onewith anatomists, and is often useful as a name,though, it must be owned, it does not explain much. 28 THE STRUCTURE AND LIFE OF BIRDS ch. ii Its remarkable form of pelvis is of great advantageto the bird. It has helped in the stiffening of thebackbone ; it gives room for the attachment of thelarge muscles necessary now the quadruped has be-come a biped ; its backward extension is useful forthe attachment of the muscles that move the tail. Thelizards pelvis, hanging downward from the backbone,looks like a di
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructurelif, bookyear1895
