Figures 3 to 5. Light microsocopic images of a living colony of Acrosphaera showing a spherical bud-like mass (Figure 3, arrow) at the side of a shell-enclosed central capsule. The protrusion eventually separates at a greater distance (Figure 4, arrow) but is connected in the rhizopodial network. At other places in the colony, mature central capsules surrounded by a shell (Figure 5) are united as a pair resembling the fossil shells in Figure 6. This may be evidence of successive shell deposition; i.e., additional central capsules are produced after most have matured.