Looking at your photo and Coastal's suggests to me that the bolts holding the bottom of the housing have loosened on yours. He has two bolts at the bottom of the housing which appear tightened down. Your photo looks like it has the same bolts, but they are backed way out. Maybe I am totally misreading the pictures, but this is what I see. Perhaps that is where your leak is coming from.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).