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