Ferrari 328 Oil Leak From Gearbox Selector Shaft

[Freddie328]

Can anyone help me understand how the gear selector rod that enters the front of the engine gets through to the gearbox? I can't work out if the shaft has seals either end to prevent contamination of the engine and gearbox oil, or if it is completely sealed from the engine oil as it passes through the crankcase.
I have a slight leak from where this shaft enters the engine but am more worried in case there are other seals which are worn, causing gearbox and engine oil to mix?
Thanks in advance for any help.

[AndrewW-G]

Sump and gearbox of a 308, showing how the shift rod passes through the engine sump and into the gearbox section