56 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
about Lake Worth, and the suggestion of the oólite at Canaveral, where 
coquina prevails, lead to the belief that the oólite of Southern Florida 
is contemporaneous with the coquina of the north." 
Itinerary. (Plate XVII.) — І left Boston on February 10th, travel- 
ling as rapidly as possible to Cocoanut Grove. Тһе railroad had not 
been opened beyond Palm Beach when 1 went down; at the time of 
my return it was open to New River. Travel by boat beyond Palm 
Beach was slow. Тһе route lay through the new canal, which com- 
pletes an inside passage from Lake Worth to Biscayne Bay. Along 
the canal were seen masses of coquina, and in places an xolian-like rock 
which had been taken from the canal. 
In a walk'of some miles about Cocoanut Grove I saw no evidences of 
any formation other than a stratified rock, which proved to be an обо 
limestone. There is a local belief, however, that large heads of coral 
occur and that the country is largely elevated reef. I felt incompetent 
to pronounce final judgment without having seen true elevated reef; 
and as there would be delay in securing a canoe for the Everglades, I 
decided to hire a man and boat and see something of elevated reefs and 
the coast line. I saw elevated reefs on Soldier and Elliott Keys, then 
followed the inside passage back of Key Largo (Plate XXII.) to Florida 
Bay, sailing among the keys and beyond Cape Sable. The waters of 
the region are shallow, and abound in flats and bars of great extent, 
many of which could not be crossed by our boat of six inches draught 
except at the narrow tide channels. In some of these tide channels, 
and often in the sounds between bars, rock bottom could be felt at eight 
to ten feet. Тһе bars, flats, and keys, however, showed nothing more 
than mud or sand; among the inside “keys” no land that is perma- 
nently above water is known to my boatman. I was afterwards told 
that Lignum Vite Key was in part high ; if this is true, it is the only 
high one in the northern half of the chain that lies west of the main line 
of keys. 
Cape Sable and vicinity is a mass of shells and shell fragments thrown 
up by waves and wind above the highest water. A charcoal burner 
near Middle Cape stated that the shell beneh extended to North west 
Cape; and he knew of no rocks inland. East of East Cape the beach 
becomes lower; a charcoal burner ten miles east knew of no rocks. 
1 The contemporaneity of coquina and of the oólitie rock (wolian) had already 
been observed by Professor Shaler. Bull. Mus. Comp. Zon, Vol. XVI. No. 7, 
р. 143. — А. Agassiz. 
2 ЖоПап rock ? — А. AGASSIZ. 
