\Cat`al*lac"ta\, n. pl. [NL., fr. Gr. ?. See
{Catallactics}.] (Zo["o]l.)
A division of Protozoa, of which {Magosph[ae]ra} is the type.
They exist both in a myxopod state, with branched
pseudopodia, and in the form of ciliated bodies united in
free, spherical colonies.