This is a condition in which the vaginal orifice is closed by an excessive development of the hymen. When complete, it causes a retention of the menses. Although the patient has all the other symptoms of menstruation, the menstrual flow does not appear. Though not sufficient to occasion an obstruction to menstruation, it may be sufficient to render the sexual act impossible. The difficulty is not usually discovered until after marriage, and may give rise to a great amount of unnecessary distress. As the difficulty can be very easily remedied by a competent physician, such an one should be at once consulted on the discovery of grounds for suspicion of the existence of this congenital deformity.