The tests of other creatures largely calcareous may well have been dissolved before reaching the sea-floor.
They had ropes, and in seconds they'd lashed us down to the sea-floor.
The cold weeds of the sea-floor kelp beds swayed eerily over and around it.
The darkness on the sea-floor was too thick, the wavering shadows too deceptive.
Away she sailed, peering amidst the many objects covering the sea-floor.
Annelids left their traces in burrows and casts on the sea-floor (Arenicolites, Cruziana, Scolithus, &c.).
From the time that any portion of the sea-floor appears above sea-level, it undergoes erosion by the various epigene agents.
This he did on the hypothesis of a gradual subsidence of the sea-floor whilst the polyps are at work.
But it is difficult to believe that the sea-floor could have subsided to such an extent in recent times.
For Hemmy had already slid down the NX-1's smooth hull and was safe on the sea-floor beside her.