| 11. | The water flow is used for one or more purposes such as mantle cavity.
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| 12. | The fertilized eggs will then move into the branchial chamber ( mantle cavity ).
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| 13. | The amber pen shell may host a number of symbionts in its mantle cavity.
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| 14. | It hangs into the mantle cavity and increases the area available for gas exchange.
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| 15. | This is followed by the head and arms being inverted into the mantle cavity.
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| 16. | The mantle cavity contains subcordate luminous organs.
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| 17. | The males release their spermatozoa from their mantle cavity in the form of sperm balls.
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| 18. | Squids swim by drawing water into their mantle cavity and expelling it through their siphon.
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| 19. | A siphon enables the animal to draw water into their mantle cavity and over the gill.
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| 20. | The body forms of nudibranchs vary a great deal, but because they are mantle cavity.
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