The thing to remember here is that spider and albino are mutations of different genes. Each gene also has a normal version. There isn't one normal gene but many normal genes.

Your square for spider het albino X albino might go something like this:

S - spider mutant version of the spider gene
s - normal version of the spider gene

A - normal version of the albino gene
a - albino mutant version of the albino gene


SsAa - Spider het albino
ssaa - Albino

.......SA......Sa......sA......sa
sa...SsAa...Ssaa...ssAa...ssaa

Where:

SsAa - Spider het albino
Ssaa - Spider albino
ssAa - Het albino
ssaa - albino