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Key Position: 21 Back to (20b)
21 a. Aperture very small with expanded flanged collar of variable width.

SEE Figure 21-1

21 b. Aperture wide, collar of variable shapes and sizes.

Proceed to 22

FIGURE 21-1

Difflugia urens Patterson et al. 1985
Difflugia urens PATTERSON et al. 1985, p. 130, pl. 3, figs. 5-14
Specimen from Midway Lake, Nova Scotia.

21a