Abstract
Electronmicrographs showed that the free border of the epithelial cells of the pyloric caeca, ileum, and rectum of the cod, Gadus morhua, is made up of microvilli. Elongated microorganisms aligned parallel to the microvilli and with one end fitting into the bases of the inter-microvillus spaces were frequently found in the rectum. Such organisms corresponded in position to peripheral interlacing filaments visible with the light microscope.

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