Figure 1
Formation and position of the ovary in Bicellariella ciliata (light microscopy). A, a pair of early female cells (arrowhead) on the periphery of the polypide bud; B, early oocytic doublet between the zooidal wall and the polypide bud; C, ovary with the early vitellogenetic doublet on the zooidal wall near the pharynx of the retracted functional polypide; D, ovary with mature oocytic doublet (macrolecithal oocyte and its nurse cell) adjoined to the gut of the retracted polypide (contact of the ovary with zooidal wall is out of plane of section). Abbreviations: co, zooidal coelom; fs, funicular strand; nc, nurse cell; o, oocyte; ov, ovary; p, polypide; pb, polypide bud; ph, pharynx; tw, transverse wall; zw, lateral and basal zooidal walls. Scale bars: A-D, 20.0 μm.