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membrane stretches between them. I he length of the projecting fringe is 0.02 mm. and its width 0.06 mm. Ihis form has a near resemblance to 5. polaris, Rüst, (Pal. Bd. xxxviii, p. 169, pl. xxv, fig. 1), it is, however, smaller and has a much less prominent central chamber. Rare. In diabase tuft from the Badoengan River.

Genus Amphibrachium, Haeckel.

The test consists of a central chamber surrounded by concentric chambered rings and with two opposite chambered ai ms lying in the equatorial plane. In some of the fossil forms included by Dr. Rüst in this genus, no central chamber is recognizable.

Amphibrachium sp. ind. a. Pl. II, fig. 15*

Only the section outline of this form is known, the central chamber is subquadrate, the arms are unequal in length and rounded or truncate at their ends. 1 otal length o. 17 mm., width of central chamber 0.045, of the arms 0.02, and their expanded ends 0.04—0.05 mm. In red jasper at Mount Badau.

Amphibrachium cordiformis sp. nov. Pl. II, fig. 14-

No central expansion or chamber is shown in the cast of this form, which consists of a nearly straight axial arm with subequal cordiform expansions, at either end. lotal length 0.245 mm., length of terminal expansions, 0.075-, width 0.065 mm.; width of the axial arm 0.022 mm. In jasper from Mount Badau.

Amphibrachium crassum, sp. nov. Pl. II, fig. 8.

Test elongate, the arms without central inflation or recognizable chamber, at either end there is an irregular lobate expansion ; the arms with numerous transverse rows of pores, about five in a row; the unequal lobate ends are similarly covered with pores. Total length 0.4 mm., width of axial portion, 0.04;