lamellibranch

He's a good subordinate, but has no more initiative than a lamellibranch.

Their shells lack a nacreous layer, and the gills are lamellibranch in form.

Named by the New Zealand Geological Survey Antarctic Expedition (NZGSAE) (1958-59) after a fossiliferous conglomerate on top of the hill which contains a Chlamid lamellibranch commonly called scallops.

In tropical oceans, there is also the problem of the teredo worm, one of the lamellibranch family of boring molluscs, whose destructive vigour proved as deadly to submarine cables as it had previously done to ships' timbers, wharves and sea dykes.