and so on

Don't use. Instead, be specific. When space is limited, use such as or like followed by an example or two.

Example
Body text is most readable in Times New Roman, Palatino, and other serif fonts. (Not Body text is most readable in Times New Roman, Palatino, and so on.)
Body text is most readable in serif fonts like Palatino.

Don't use and so on to end a phrase that begins with for example, such as, or like. It's redundant.

Example
Body text is most readable in serif fonts, such as Times New Roman and Palatino. (Not Body text is most readable in serif fonts, such as Times New Roman, Palatino, and so on.)