Key Position: 10 Back to (7b)
10 a. Test with a distinct constriction at the base of the neck.

SEE Figure 10-1 .

 10 b. Test without constriction at the base of the neck.

Proceed to 11

FIGURE 10-1

Pontigulasia compressa (Carter 1864)
Difflugia compressa CARTER, p. 22, pl. 1, figs. 5-6
Pontigulasia compressa (Carter) MEDIOLI and SCOTT 1983, p. 35-36, pl. 6, figs. 5-14
Specimen from Swan Lake, north of Toronto, Ontario.