\En`te*rop*neus"ta\, n. pl. [NL., fr. Gr. ? an
intestine + ? to breathe.] (Zo["o]l.)
A group of wormlike invertebrates having, along the sides of
the body, branchial openings for the branchial sacs, which
are formed by diverticula of the alimentary canal.
Balanoglossus is the only known genus. See Illustration in
Appendix.