Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index / Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

by Ernst Haeckel

Tangential tubes cylindrical, more or less curved, gradually tapering towards the two pointed ends. Calymma with a voluminous phæodium.

Dimensions.—Length of the tubular spicule 0.25, breadth 0.003.

Habitat.—Mediterranean, Messina, surface.

2. Cannobelos calymmata, n. sp.

Tangential tubes cylindrical, straight, of equal breadth throughout their whole length, closed by a hemispherical cap on the two rounded ends. Calymma very voluminous, with a small phæodium.

Dimensions.—Length of the tubular spicula 0.3 to 0.5, breadth 0.004 to 0.008.

Habitat.—Central Pacific, Stations 263 to 274, surface.

3. Cannobelos thalassoplancta, n. sp.

Tangential tubes spindle-shaped, straight, gradually tapering towards the two pointed ends. Calymma and the included phæodium rather voluminous.

Dimensions.—Length of the tubular spicula 0.15 to 0.2, breadth in the middle part 0.02.