Didinium has two bands of ciliated basal bodies that encircle the cell, one adorally and one aborally. The bands are composed of groups of approximately 15 ciliated basal bodies. This section is a longitudinal section of the cilium and basal body and cross section of approximately seven different groups or pectinelles. The proximal end of basal bodies are ensheathed in electron opaque sleeves from which microtubular ribbons extend into the adjacent ridges on the two sides of each basal body. TEM taken on 5/20/69 by R. Allen with Philips 300 operating at 60kV. Neg. 14,800X.Bar = 0.5µm. The negative was printed to paper and the image was scanned to Photoshop. This digitized image is available for qualitative analysis. A raw, unprocessed, high resolution version of this image (CIL:4664) is in the library and available for quantitative analysis. Standard glutaraldehyde fixation followed by osmium tetroxide, dehydrated in alcohol and embedded in an epoxy resin. Microtome sections prepared at approximately 75nm thickness. Additional information available at (http://www5.pbrc.hawaii.edu/allen/).