Small squeeze and (especially) tighten basal segment tended to occur more often early in copulation.
After 7 days the basal stems were resterilized and freshly cut, and the raceme explants were transferred to fresh medium.
Apical setts: grey; middle setts: white; basal setts: hatched. s. e. are shown as vertical lines.
As the basal solid forms and releases fluid depleted of component /3, the composition of the melt falls.
Ammonoids are restricted to the basal part of the mudstones.
Petiole with dorsal lateral carinae strongly elevated over basal half, much weaker posteriorly, but extending to posterior margin.
The apical lamellae and basal invaginations are characteristic features of trematode excretory epithelium and are believed to be concerned with its absorptive capacity.
These vesicles which tended to have a central to basal distribution, occasionally filled almost the entire cytoplasm, but there was no evidence of circulation.
