Fig. 2.29 Schematic longitudinal section of terminal cleithral ovicell
in Cribrilina annulata . Abbreviations: bc brood cavity, bcw broodcavity wall, ес ectooecium, en entooecium, ер epistege, fw frontal
membranous wall, m muscular bundles of brood-cavity wall, mz maternal
zooid, oc ooecial coelom, ok kenozooidal ooecium, op operculum, os
oral spine, рр pseudopore, sp spinocyst
Fig. 2.28 Schematic longitudinal sections of endozooidal semicleithral ovicells in: ( A ) Puellina radiata ; ( B ) Puellina hincksi (each
ooecium shows a pelmatidium; closed horizontal slit of ooecium
arrowed ) (( B ) – From Ostrovsky 2002 , with modifi cations, courtesy
of Taylor and Francis Ltd.). Abbreviations: bc brood cavity, bw basal
wall, dz distal zooid, ес ectooecium, en entooecium, ер epistege, fw
membranous frontal wall, m muscle strands of ooecial vesicle, mz
maternal zooid, oc ooecial coelom, of ovicell fl oor, op operculum, sc
sclerite of ooecial vesicle, sp spinocyst, tw transverse wall, v ooecial
vesicle