Note 541 — Chapter XII · THE SPIRAL SHELLS OF THE FORAMINIFERA
Reading edition
Bénard, H, Les tourbillons cellulaires, Ann. de Chimie (8), XXIV, 1901. Cf. also the pattern of cilia on an Infusorian, as figured by Bütschli in Bronn’s Protozoa, III, p. 1281, 1887.