Slug A, at top, is slipper-shaped with dark spots on body. Snail B, below, has flatter body and helical shell on middle of back. Black and white art.

Figure 14A–B. Slug (no shell present) (A) and snail (helical shell present) (B).

Slug A, at top, is slipper-shaped with dark spots on body. Snail B, below, has flatter body and helical shell on middle of back. Black and white art.

Illustrations by USDA.