catallactics (katalaktiks)

[« Gr. καταλ λακτικός, easy to reconcile, but taken in its literal sense of 'changeable, having to do with exchange,' One eminent writer has proposed as a name for Political Economy Catallactics , or the science of exchanges. J. S. Mill , Pol. Econ., III. i. § 1. Catallactidæ (kat-a-lak'ti-dē), n. pl . [NL.. Cat all act a + -ida .] A family of pelagic poly mast i gate pan to stomatous infusorians, corresponding to Haeckel's group of Cat all act a , coherent in social clusters, with their anterior and exposed border clothed with long vibratile flagella, and with no distinct oral aperture.