rock is a reddish chert, crowded with casts of radiolaria, of forms similar to those in Nos. 73 and 85, with the addition of Rhopalastrum.
Ser. II. No. 107. River Kapoewas near the mouth of River Gung. A mottled reddish and greenish chert, traversed by quartz veins. Radiolaria very numerous but imperfect.
Ser. II. No. 133. River Kapoewas, near mouth of River Tandjan. Dark red jasper with numerous radiolaria, the tests are infilled with clear cryptocrystalline silica, in some instances the lattice structure is shown. Cenellipsis very abundant; Rhopalastrum, fragmentary Hagiastrum, and many Cyrtoidea are also present.
Ser. II. No. 136. River Kapoewas, near the Mimit Rapids. A red jasper containing numerous radiolaria of forms similar to the preceding, and also many Sphcerozoum spicules.
Ser. II. No. 143. River Boengan. Light brownish translucent chert, alternating with beds of speckled chert with dark red spots. The rocks traversed by fine quartz veins. The radiolaria are similar to those in Nos. 133, 136.
Ser. II. No. 148. River Boengan, near mouth of River Titi. A light, translucent chert (hornstone) with faintly shown casts of radiolaria.
Ser. II. No. 153. River Boengan, near River Kalësoewan. The rock is a compact, bluish-white chert with a porcellanic aspect. It is thickly filled with casts of radiolaria, principally belonging to Cenosphcera, Cenellipsis, Sphcerozoum and Cyrtoidea. In some the tests are filled with chalcedonic silica. A chemical analysis of this rock is given below.
Ser. II. No. 155. Riam Bi, River Boengan. A compact red jasper, traversed in all directions by veins of quartz. Radiolaria very numerous, of the same forms as in the preceding. An analysis of the rock is given below.
Ser. II. No. 357. Path leading from River Banjoe to River Leja. A compact reddish chert, with quartz veins. Thickly filled with similar forms of radiolaria to those in Nos. 153,