3. The _heart-shaped_ or _cordiform hymen_, the general shape of which may be circular, ovoid, or even semilunar, but in which from the middle of the upper or lower margin a three-cornered tongue projects across the aperture, which is thus given the form of the conventional heart of a pack of cards. 4. _The infundibuliform hymen_ has the form of a small projecting funnel resembling in appearance the invaginated end of the finger of a glove. _Maschka_ refers also to the rare condition in which the hymen is sometimes said to be absent. As a matter of fact, however, in such cases, it is represented by a very narrow annular eminence, the genitals being in other respects normal. The smooth character of the eminence will serve to differentiate it from the remains of a destroyed hymen. Other rare forms are: 1. The _imperforate hymen_, an occlusive membrane, entirely blocking the vaginal orifice. In some cases, however, the hymen is not absolutely imperforate, a very small, punctiform aperture being present. 2. The _cribriform hymen_, a hymen which is “imperforate” in the sense that there is no opening of a size approaching the normal, but in which several minute apertures are present. 3. The _septate_, _bridged_ or _divided hymen_ (_hymen bifenestratus_, etc.), exhibits a strip of mucous membrane, most commonly running directly from before backward, occasionally, however, somewhat obliquely, across the aperture in the membrane, which is thus divided into two equal or unequal parts. In some instances the process that bridges the aperture of the hymen is expanded in the vertical plane to form a septum which projects for some distance into the vagina. [Illustration: FIG. 24.—Septate Annular Hymen. ] [Illustration: FIG. 25.—Septate Semilunar Hymen. ] [Illustration: FIG. 26.—Extremely tough Annular Hymen, with an obliquely disposed Septum. ] [Illustration: FIG. 27.—Septate Hymen with Apertures of unequal size. ] 4. The _lobate_, _lobulated_, or _labiate hymen_, which consists of several (two to four) lobes on either side, each overlapping the next like the tiles in a roof, whilst the aperture between the two sides has the form of an antero-posterior slit (FIG. 37); in some cases the lobes of a lobulated hymen are so disposed that the membrane has the appearance of a fold of mucous membrane with a central furrow. [Illustration: FIG. 28.—Septate Hymen with Apertures of unequal size. ] [Illustration: FIG. 29.—Hymen with rudimentary Septum. ] [Illustration: FIG. 30.—Hymen with posterior rudimentary Septum. ] [Illustration: FIG. 31.—Labiate Hymen with posterior rudimentary Septum. ] It is obvious that an imperforate or cribriform hymen, by the hindrance it offers to the passage of the menstrual discharge, is liable at the time of the menarche, and as soon as menstruation begins, to give rise to serious disorder and to pathological states. [Illustration: FIG. 32.—Hymen with anterior rudimentary Septum. ]