Observations on Argentophilic Granules of Certain Peritrichs*

SYNOPSIS. Studies of certain members of the order Peritrichida, namely species of Carchesium, Epistylis, Vorticella and Zoothamnium, have revealed prominent argentophilic granules, probably cuticular pores, on the bells of all species, located on the transverse striations which encircle the bells. With light microscopy they appear similar to the basal bodies or kinetosomes found in the peristomal regions of the sessile forms, in the posterior ciliary girdles of the telotrochs, and in the scopulas of both sessile and motile organisms. Telotrochs of the various species are depicted with single and multiple rows of the basal bodies from which the membranelles of the locomotor girdles arise.