How do I remove Apple UDIF read-only compressed (bzip2) Media?

Macbook Air (Early 2015)

OS X El Capitan 10.11.3

Intel Core i5

I have at least 3 of these Disk Images on my Disk Utility screen and cannot figure out how to remove them.

Screen Shot 2016-02-25 at 6.29.47 PM.png

MacBook Air (13-inch, Early 2015), OS X Yosemite (10.10.3)
Has invited:

howapple - hello

Favor from:

Clic on Mount; then you can eject it from desktop

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