Further to my previous post about the unusual bulge of NGC 6771, here is an image of it from the Carnegie-Irvine Galaxy survey (
http://cgs/obs.carnegiescience.edu/CGS/Home.html )
As you can see, the "bulge" (if that is what it is) is not what we usually think of as a normal bulge.....yet there are plenty of these seen in some clusters of galaxies.
The reason this looks so unfamiliar is that our "baseline truth" about how galaxies look comes from galaxy atlases like the Carnegie Atlas of Galaxies, the Hubble Atlas of Galaxies, and the De Vaucoleurs Atlas of Galaxies, all of which tend to emphasize the sorts of galaxies which occupy low-density environments.
In contrast, the spiral and S0 galaxies in the more dense galaxy clusters tend to have a "certain look about them" which is unfamiliar, relative to the morphologies you find in these galaxy atlases.
Not as pretty as the spirals, but a lot more unusual!
