There is only one type of coelem. The coelem is a fluid-filled cavity formed within the mesoderm of some animals, pictured below:
Garden snails belong to the phylum ‘Mollusca,’ the class ‘Gastropoda,’ and the phylum ‘Coelomate,’ which basically means they have a coelem as described above. However, there are two different kinds of coelemates, which may be what your question was referring to. The difference between the two types is how the coelem is formed, not the coelem itself. In protostomes, the coelom forms in the space between the body wall and digestive cavity, whilst in deuterosomes, the coelom forms as outgrowths of the digestive cavity. Garden snails are protostomes.
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