"Knob" at the periphery of Descemet's membrane.

however is that the ustuall flat tissue between ai and the trabecula (b) may proje(t backwards as a knob (c). This swelling is granular and does not contain cells (Figs 2 and 3). Here this knob-like bulge has been -demonstrated in five eyes, three knobs w-ere normal and tw,o were malignant melanomata. Generally, the five cases (Figs 2-6), show the different structure of the knob, the prominent zone in the area of the gap. We understand that the aqueous fluid enters the gap and reaches the posterior lamellae. The aqueous does not filter the posterior