Partitions not showing up on startup manager

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Hi, I have 2 partitions on my Mac HDD but when I hold the option key while starting up. It only shows the HDD and I can't chose a partition. How come?

I uploaded a screenshot, you see my HDD named 'Yosemite' has two partitions 'Yosemite' and 'Macintosh HD'. I can't chose 'Macintosh HD' when starting up.

Schermafbeelding 2014-07-27 om 15.39.05.png
 

Macost

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Mar 4, 2014
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Yes that's how I installed Yosemite.

I changed my startup disk via system preferences so I can boot into my other partition.