Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) / Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

by Ernst Haeckel

3. Acanthonia denticulata, n. sp.

Spines quadrangular prismatic, with prominent elegantly denticulated edges, of equal breadth throughout their whole length. Both ends pyramidal, without leaf-cross. (Similar to Amphilonche denticulata, but with the twenty spines all equal, and with spherical central capsule.)

Dimensions.—Length of the spines 0.12 to 0.16, breadth 0.008.

Habitat.—Central Pacific, Stations 266 to 274, surface.

4. Acanthonia mülleri, Haeckel.

Acanthometra mülleri, Haeckel, 1862, Monogr. d. Radiol., p. 379, Taf. xv. fig. 3, Taf. xviii. fig. 6.

Spines quadrangular, nearly prismatic, but tapering gradually from the pyramidal base towards the distal bifid apex, which bears two thin, parallel, or little divergent teeth; four edges elegantly denticulated; base without leaf-cross. Central capsule yellowish or reddish.

Dimensions.—Length of the spines 0.12 to 0.18, basal breadth 0.005.

Habitat.—Mediterranean (Messina); Atlantic, Stations 348 to 352, surface.

5. Acanthonia fragilis, Haeckel.