MODIFIED CLASSIFICATION. “One hundred twenty one forms of falling ice: the new snow classification system. Magono and Lee did not include at least one very common type as well as a few other interesting types. This major omission was snow-crystal aggregates, generally known as “snowflakes” by meteorologists.”
http://www.storyofsnow.com/blog1.php/one-hundred-twenty-one-forms-of-falling-ice-the-new-snow-classification-system