| 1. | The pneumostome lung cavity is heavily vascularized to allow gas exchange.
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| 2. | Banana slugs have a single lung which opens externally via a pneumostome.
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| 3. | The pneumostome opens and closes in a cyclical manner.
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| 4. | These groups lack a pneumostome, having a much larger opening to the cavity.
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| 5. | Banana slugs have a single lung ( on the right side ) which opens externally via a pneumostome.
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| 6. | The placement of the pneumostome on the mantle helps to distinguish the species of " Ariolimax ".
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| 7. | Air enters through the pneumostome into the animal's single lung, the air-filled mantle cavity.
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| 8. | There are two light brown bands on the dorsum and mantle, the right band passes above the pneumostome.
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| 9. | Dark lateral bands run relatively deeply at the sides and the pneumostome is usually enclosed by right-side band.
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| 10. | However, the position of the pneumostome is often not at all easy to discern when this orifice is completely closed.
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