S109

Porodiscus (?) sp. B

Ommatodiscus sp., Benson, 1966, p. 210, pl.10, fig. 4 (only).

DESCRIPTION "Shell is an irregular disc, becoming thinner toward the periphery. Central structure a single lattice sphere obscured by some spongy mesh-work (hence the questionable inclusion of this species in Porodiscus). Concentric latticed chambers irregular, appearing as discontinuous, "wobbly" rings. Pores numerous, subcircular, becoming smaller toward shell margin." (Gail Lombari, unpublished data).

DIMENSIONS "Based on 15 specimens. Shell diameter 147-196 microns." (Gail Lombari, unpublished data).

Plate 14, figures 3, 4

S110

RECENT DISTRIBUTION

1. Molina-Cruz, 1975, Code S48 (Ommatodiscus sp. B); "This species is distinguished by the irregular discontinuous internal rings". Used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent S48 at each station.

2. Robertson, 1975; see Porodiscus sp. A.