Figure 20 in Brood chambers constructed from spines in fossil and Recent cheilostome bryozoans

Figure 20. Bellulopora bellula (Osburn), Recent, Florida, Atlantic Ocean, NHM 1986.8.14.20. A, ovicell at colony growing edge. B, complete ovicell. C, interior of the ovicell, showing part of the peristome underlying the ovicell opening. D, basal pore chamber (centre bottom), two costal pores and intercostal fusions. E, interior of the ovicell; lower part is the cavity of a kenozooid (floor partly visible) that communicates with its pore chambers through the pores; upper part is the brooding cavity. F, higher magnification of the boundary between the wall of the cavity of the kenozooid (lower right) and the internal wall of an ovicell rib (upper left). Scale bars: A, B = 100 Mm; C-E = 50 Mm; F = 5 Mm.