Ans.: Mehlis’s glands, though also known as shell glands, do not play any role in shell-formation. They are a cluster of unicellular glands and surround the junction of oviduct, medial vitelline duct and uterus. Their secretion helps in lubricating uterus for smooth passage of eggs and in activating sperms. This secretion, perhaps, also causes release of shell globules from vitelline gland cells.
Ootype may be defined as a part of the oviduct of certain trematode worms in which the ova are completed and furnished with a shell.