| 1. | There are thin gill filaments on either side of the ctenidium.
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| 2. | Osphradium is narrow, positioned slightly posterior to middle of ctenidium.
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| 3. | The ctenidium, the respiratory gill-comb, is very broad.
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| 4. | Ctenidium is positioned a little in front of pericardium.
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| 5. | At the posterior of the ctenidium is a remarkably large and well-developed heart.
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| 6. | The shells of these two last genera house a hypertrophied ctenidium large quantities of symbiotic bacteria.
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| 7. | This proportionally giant heart primarily sucks blood through the ctenidium and supplies the highly vascularised oesophageal gland.
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| 8. | The ctenidium ( a comblike respiratory apparatus ) goes along most of the length of the pallial cavity.
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| 9. | The gill is flaplike with a bipectinate ctenidium situated in the nuchal cavity and lacks secondary pallial gills.
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| 10. | A "'ctenidium "'is a respiratory organ or gill which is found in many mollusks.
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