By referring to the description of the perfect pelvis, given in the early part of the work, the nature of these changes will be readily understood, particularly if the plates given there are compared with those given here. PLATE XL. Represents the _standard_ form, with which the rest must be compared. PLATE XLI. Represents a pelvis which resembles that of the male in its form, and is therefore called _masculine_. It is deeper, and less capacious altogether than the standard one. This form is occasionally met with in females of a peculiar general conformation, and temperament, approaching that of the other sex. It is not a sufficient deviation from the natural form to create any great difficulty, though it may cause delay. [Illustration: Plate XL. Represents the _standard_ form of the Pelvis.] [Illustration: Plate XLI. Masculine Pelvis.] PLATE XLII. Represents the peculiar deformity most frequently produced by _Mollites Ossium_. The different parts are stretched out as it were, and crushed inwards toward each other. The size of each strait is diminished in nearly every diameter, and the whole form is very unfavorable to delivery. This is sometimes called a _cordiform_ pelvis. Observe the difference between it and the standard one. PLATE XLIII. This is called an _Ovate_ Pelvis. It appears as if it had been crushed by a heavy weight, from above downward, the sacrum being depressed below the plane of the pubes. In this case the antero posterior diameter of the upper strait is so much lessened that the two halves appear nearly separated, and form almost a figure of eight (8). [Illustration: Plate XLII. Represents the peculiar deformity most frequently produced by _Mollites Ossium_.] [Illustration: Plate XLIII. This is called an _Ovate_ Pelvis.] PLATE XLIV. This is another kind of deformity, in which one side is sunk down below the other, while both are twisted as it were round the sacrum. PLATE XLV. This is a section of a Pelvis to show the effect of a corroding disease of another kind. The whole of this is such a mass of disease and deformity as to preclude any particular description. [Illustration: Plate XLIV. This is another deformity, in which one side is sunk below the other, and both twisted round the sacrum.] [Illustration: Plate XLV. The effect of corroding disease.] Curvature of the spine sometimes affects the pelvis, when low down, and therefore if any female is affected with it she should not marry before being examined. Several diseases and lesions of the hip-joint, and of the thigh, may also do the same, and should therefore be suspected.