AGASSIZ: THE FLORIDA ELEVATED REEF. 49 
the general line of the Keys.! 'These passages give exit to the mass 
of material disintegrated from the small keys of the group. Тһе bot- 
tom of the interior is naturally barren, being covered with a sticky marl, 
upon which grow mangroves and on which we find an occasional hole of 
Calianassa, a Limulas, or a skate swimming about, and Thalassia growing 
plentifully upon parts of the bottom. 
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и” MARQUESAS KEYS 
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May not the keys of the bank to the eastward of the Marquesas be 
merely the remains of similarly disintegrated land, the greater part of 
which has been eroded, leaving only the scattered keys between the 
Margnesas and the west sido of Key West Harbor? (See Coast Survey 
Chart, No. 169.) 
1 A. Agassiz, “Тһе Tortugas and Florida Reefs," Mem. Amer. Acad., 1888, Vol. 
XI. p. 118, Plate V. See also Three Cruises of the Blake," Bull, Mus. Comp. 
Zon, Vol. XIV. p. 172, Fig. 44. 
