Translation of "Mollusks" in Japanese

All the mollusks she is capturing, they're quite easy to catch, but they've got these incredibly hard shells.

‎軟体動物はどれも ‎捕まえやすいが ‎硬い貝殻が厄介だ

But some of these mollusks will only relax if that drill is precisely in the apex of the shell, on the abductor muscle.

‎外転筋のある場所を狙って ‎正確に穴を開けないと—— ‎暴れ出すことも