Image of the extracellular, non-contractile stalk of Opercularia coarctata that is formed from the scopula. Cylinders ('straws') of fibrous material in the lumen of the stalk are surrounded by an outer membrane-like sheath. The fibrous cylinders have diameters similar to those of basal bodies. TEM taken on 6/10/69 by R. Allen with Philips 300 operating at 60kV. Neg. 14,800X. Bar = 0.5µm. A print of the negative was scanned and processed in Photoshop. This image is best used for qualitative analysis. A high resolution image (CIL:7455) is 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/).