Figure 4 in Ultrastructure of the pseudocnidae of the palaeonemerteans Cephalothrix cf. rufifrons and Carinomella lactea and an assessment of their phylogenetic utility

Figure 4. Cross-sections of the proboscis of Carinomella lactea. (A) Survey transmission electron micrograph of the proboscis. Note the pseudocnida-forming cell containing pseudocnidae (arrow). (B) Low-power micrograph revealing two groups of pseudocnidae (arrows) resting on secretions (*) of underlying gland cells. (C) Cross section of a group of pseudocnidae (ps) and a sensory bristle of an adjacent sensory cell. (D) Low-power micrograph of longitudinal sections of pseudocnidae. Note the filament core (fc). Abbreviations: cm, circular muscle; em, extracellular matrix; fc, filament core; gc, gland cell; lm, longitudinal muscle; pc, pseudocnidaforming cell; pe, proboscis peritoneum; pn, proboscis nerve; ps, pseudocnida; sc, sensory cell cilium.