2) is like that of the Oligochaeta and Hirudinea in that the coiled glandular tube has an intracellular duct which is ciliated in the same way in parts.
In the same and other leading forms a pair of much-coiled glandular tubes, the coxal glands (coelomocoels in origin), is found with a duct opening on the coxa of the fifth pair of appendages of the prosoma.
The shell necessarily takes this form also, and then becomes coiled in a dorsal or anterior plane - that is to say, it becomes exogastric. This condition may be seen in embryonic Patellidae, Fissurellidae and Trochidae (fig.
coiled הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד