perivitelline (per"ivitelin)

[ colonies, often in the latter instance forming branched tree-like growths; they have the oral aperture terminal or subterminal; ciliary system consisting of an anterior, circular or spiral, adoral wreath with occasionally one or beriwig (1 more supplementary equatorial or posteroterminal loco caused by a shrinking of the former). periwickt, n. An obsolete form of periwig. periwig (per'i-wig), n. [Formerly also perriwig, smooth. In those instances in which the adoral wreath takes a spiral form the right limb is more usually involute and descending into the oral fo a. The anal aperture is posteriorly located or debouching upon the ves perewake (these forms having peri-, pere- for per-, appar. by a ociation with peri-, the prefix (cf. periwinkle1, periwinkle2, where also peri band-like. These infusorians multiply by longitudinal or transverse fi ion. There are eight or ten families, all free excepting the Vorticellidæ. See cut under Vorticella. peritrich an (pe-rit'ri-kan), n. [ order Peritricha. peritrichous (pe-rit'ri-kus), a. [NL. * peri che, around, + θρίξ ( τριχ- ), a hair.] Having a zone of cilia around the body; of or pertaining to the Peritricha. See cut under Vorticella .