S61

Ommatogramma dumitricai Petrushevskaya

Ommatogramma dumitrica Petrushevskaya, 1975, p. 577, pl. 7, fig. 3; Pl. 37. figs. 4,5

DESCRIPTION AND DIMENSIONS "The main skeleton body is about 50mu broad in its central part, about 75mu broad in its arms and 200-250mu long. The central part of the skeleton and the base of the arms are surrounded by a patagium (as by a muff), about 100mu-150mu long. The outlines of the main body of the skeleton and the layers of the patagium are X- shaped. The radial spines are weak. The pylome is in one of the arms. Gown with small pores covers only the patagium. Differs from Spongurus pylomaticus Riedel. . . by: smaller dimensions, the outline of the skeleton, the more delicate gown, and the presence of patagium. The intermediate species (?), similar to the species in question and to S. pylomaticus was illustrated by Kruglikova (1969). O. dumitrikii differs from Spongocore puella Haeckel, Spongocore late Campbell and Clark and some other similar species by not having a thickened central part of the main skeletal body, and thus having a different skeletal outline." (from Petrushevskaya, 1975).

REMARKS

1. Note inconsistent spelling of the specific name in Petrushevskaya (197 5); "dumitricai" is thought to be correct.

2. Petrushevskaya (1975) considers this species to be so different from Spongurus pylomaticus as to require a separate genus. However, in counting specimens it may not be possible to readily distinguish between the two.

Plate 8, figure 1

S62

RECENT DISTRIBUTION

1. Petrushevskaya, 1975; DSDP Site 278 (56deg 33.42'S, 160deg 04.29'E).