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The diluted acid is used internally to relieve vomiting or gastric pain.
c 1, and c 2, The anterior two pairs of gastric caeca and ducts of the mesosomatic region.
A, prosomatic gastric gland (sometimes called salivary).
The radial canals are represented by wide gastric pouches, and may be absent, so that the tentacles arise directly from the stomach (Solmaridae).
Of these iron and ammonium citrate is much used as a haematinic, and as it has hardly any tendency to cause gastric irritation or constipation it can be taken when the ordinary forms of iron are inadmissible.