| 31. | Pseudofeces accumulate with, and look much like, the actual feces in the bottom of the mantle cavity.
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| 32. | The anus opens on the ventral / underside of the animal, roughly in the middle of the mantle cavity.
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| 33. | The female extends her ovipositor into the mantle cavity of the mussel and deposits her eggs between the gill filaments.
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| 34. | In some brachiopods groups of chaetae help to channel the flow of water into and out of the mantle cavity.
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| 35. | In aquatic gastropods, the nephridium is drained by a ureter that opens near the rear of the mantle cavity.
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| 36. | The ventral surface is bordered with the mantle and moving towards the center of the chiton is the mantle cavity.
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| 37. | All nemerteans move slowly, using their external cilia to glide on surfaces on a trail of mantle cavity of molluscs.
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| 38. | The female extends her long ovipositor into the mantle cavity of the mussel and deposits her eggs between the gill filaments.
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| 39. | During mating, this arm is detached, and kept by the female in her mantle cavity until used for fertilisation.
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| 40. | Sperm from these is passed along the extensible penis into the mantle cavity of an adjoining individual where fertilisation takes place.
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