. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. egion appears to dependlargely on the varying character of the sea the limits of the zone which we are considering(from the lower limit of the Laminarian Zone to theedge of the Continental Shelf) it may be said that thedifferences of fauna due to depth are insignificant, ascompared with those associated with the different kindsof bottom, and therefore it is impossible to attachimportance to the subdivisions of this zone which havebeen proposed. The types of sea bottom us
. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. egion appears to dependlargely on the varying character of the sea the limits of the zone which we are considering(from the lower limit of the Laminarian Zone to theedge of the Continental Shelf) it may be said that thedifferences of fauna due to depth are insignificant, ascompared with those associated with the different kindsof bottom, and therefore it is impossible to attachimportance to the subdivisions of this zone which havebeen proposed. The types of sea bottom usually metwith may be arranged in a descending series beginningwith rock and passing through stones, gravel, sand andgravel, pure sand and muddy sand, to mud, varied bythe occurrence of beds of dead shells or of the calcareousalga usually known as coral (Lithothamnian). Inany given district it is usual to find that each of theabove-named types of bottom has its own specialfauna, and that many species seem to recognize a moreminute subdivision than man, whose observations are 17 258 ANIMALS OF THE SEA FLOOR. Fig. 184.—Chiton.
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