A Numemon discovered the rolling shell data of a Crustacean Digimon on the coast of the Net Ocean and as a result, it withdrew itself, racking its brains with courage in order to defend itself, and it became as though it were a Digimon shaped like a slug. It is slightly more intelligent than other Numemon, but it has a timid personality to the point that even the slightest things withdraw it into its astonishing shell. Its defense is very high when it withdraws into its shell, and is solid even if kicked or stepped on. Its Special Moves are concealing its body inside its shell and attacking with it (Shell's Attack) and throwing feces stored in its shell (Jukusei Unchi).

ネットの海の海岸に転がっていた甲殻類デジモンのデータの殻を発見したヌメモンが、身を守るために勇気と知恵をしぼって閉じこもった結果、まるでナメクジのような姿のデジモンになった。他のヌメモンより少し賢いが、ちょっとしたことでも驚き殻に閉じこもるほど臆病な性格である。殻に閉じこもった時の防御力は非常に高く、踏まれても蹴飛ばされても頑丈である。必殺技は、殻の中に体を隠して殻ごとぶつける「シェルズアタック」と、殻の中に溜め込んだウンチをこんもり投げる「熟成ウンチ」。