S11

Polysolenia arktios Nigrini

Polysolenia arktios Nigrini, 1970, p. 166, pl. 1, figs. 4, 5

DESCRIPTION "Shell smooth, spherical with numerous randomly arranged, subcircular and irregular pores of varying size. Shell very spiny, one or more poreless spines up to one-third the length of the shell diameter project outward from most pore margins. Spines may fork, or 2 or more spines arising from a single pore may meet at a point; they may be needle-like or flat, blunt projections. Rarely, specimens with an extra-cortical shell have been observed... "This species appears to be closely related to but its restricted distribution in Subarctic sediments seems to warrant a taxonomic distinction." (from Nigrini, 1970).

DIMENSIONS "(based on 20 specimens). Shell diameter 103-238 microns. Maximum length of spines 48 microns." (from Nigrini, 1970)

REMARKS

1. This species is probably the Northern form of Polysolenia spp. in Sachs, (1973).

Plate 2, figure 1

S12

RECENT DISTRIBUTION

1. Nigrini, 1970, fig. 5; belongs to a subarctic assemblage derived by recurrent group analysis of North Pacific samples.

2. Ling et al., 1971; "... found only sparsely from the Bering Sea samples."