Bill:

No, that's called a "single twin tube" bulb.

It's an early style compact fluorescent bulb that was used in the 1990's.

Before compact fluorescent bulbs came with screw type Edison bases, they had a different base which you can see in these pictures:

http://s7d5.scene7.com/is/image/Staples/s0411919_sc7?$splssku$

http://stoppingatthegreenlight.files...cent_light.jpg

So far as I know, you simply pull the old bulb straight out and push the new one straight in.

I've seen these kinds of bulbs for sale at Home Depot, but you should be able to buy them at any lighting store.