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

Dimensions.—Transverse axis of the shell 0.1, sagittal axis 0.06.

Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.

4. Tympanidium barbadense, Haeckel.

"Hollow cylinder," &c., Bury, 1862, Polycystins of Barbados, pl. xvi. fig. 1.

Shell with sixteen gates; the four lateral gates double, bisected by an incomplete equatorial ring. Basal gates kidney-shaped, of the same breadth as the circular mitral gates, but twice as long. Equatorial outline of the shell elliptical. All rods of the shell thin, smooth.

Dimensions.—Transverse axis of the shell 0.12, sagittal axis 0.08.

Habitat.—Fossil in South Naparima, Trinidad, Barbados.

5. Tympanidium staurocircum, n. sp.

Shell with sixteen gates; the four lateral gates double, bisected by an incomplete equatorial ring. Basal and mitral gates of the shell of about equal size, roundish. Equatorial outline of the shell violin-shaped, with a sagittal constriction. All rods of the shell armed with short irregular spines.

Dimensions.—Transverse axis of the shell 0.12, sagittal axis 0.06.