Abstract
This paper describes the morphology and size of perforated ray cells in Bathysa meridionalis Smith & Downs and compares its features with the adjacent ray cells and vessel elements. The perforated ray cells are much bigger and more voluminous than normal ray cells. Their shapes vary from ellipsoid to polygonal. The perforation plates may be solitary to tree per wall, round to reniform. The dimensions of perforated ray cells suggest that they are at least as effective for water flow as axial vessel elements.
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