Search the Dictionary

Of or pertaining to the Nemertina. -- n.

One of the two orders of Nemerteans. See Nemertina.

A genus of nemertean worms, parasitic in the gill cavity of clams and other bivalves. They have a large posterior sucker, like that of a leech. See Illust. of Bdellomorpha.

Nemertean.

Nemertean.

The free-swimming, hat-shaped larva of certain nemertean worms. It has no resemblance to its parent, and the young worm develops in its interior.

A group of nemerteans comprising those having a deep slit along each side of the head. See Illust. in Appendix.

ternally with vibrating cilia. It includes the Rhabdocoela and Dendrocoela. Formerly, the nemerteans were also included in this group.

ducts, or sap tubes. -- Water vascular system (Zoöl.), a system of vessels in annelids, nemerteans, and many other invertebrates, containing a circulating fluid analogous to blood, but not of the same composition. In annelids the fluid which they contain is usually red, but in some it is green, in others yellow, or w…

ion of the animal kingdom, including the parasitic worms, or helminths, together with the nemerteans, annelids, and allied groups. By some writers the branchiopods, the bryzoans, and the tunicates are also included. The name was used in a still wider sense by Linnæus and his followers.