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

Acanthochiasma rubescens, Haeckel, 1862, Monogr. d. Radiol., p. 403.

Spines cylindrical, of equal breadth in their whole length, not very elastic, pointed at the two ends. Central capsule intransparent, reddish, with violin-shaped concretions. Granules of the sarcode red coloured.

Dimensions.—Length of the spines 0.2 to 0.6, breadth 0.004 to 0.006.

Habitat.—North Atlantic, Madeira, Krohn; Lanzerote, Haeckel.

3. Acanthochiasma fusiforme, Haeckel.

Acanthochiasma fusiforme, Haeckel, 1862, Monogr. d. Radiol., p. 404, Taf. xix. fig. 8.

Spines spindle-shaped, from the thicker central part thinned towards the two thin conical ends, perfectly straight and smooth, rigid, inelastic. Central capsule non-transparent, brown.

Dimensions.—Length of the spines 0.3 to 0.5, breadth in the central part 0.006 to 0.009.

Habitat.—Cosmopolitan; Mediterranean, Atlantic, Pacific.

4. Acanthochiasma spirale, n. sp.