Slide showing diagram of 'The currents present in the mantle cavity of a Brachiopod'. Slide shows diagram of 'The currents present in the mantle cavity of a Brachiopod'. Brachiopods are two-shelled, marine animals. Diagram is labelled with corresponding explanations. Title under image reads 'Fig. 2. Diagram of the currents present in the mantle cavity of a Brachiopod as represented by Crania. A - Inhalent chamber of one side; B - exhalent chamber. Large arrows indicate course of main currents, inhalent below, exhalent above; between currents through the lophophore. The dotted arrows on the lophophore and gill-filaments indicate course of the food-collecting streams. (After Orton (1914), Fig 4. By kind permission of the Marine Biological Association.' Late 19th - early 20th century