82 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
edge crops out on the north side of Bahia Honda. 'Fhe elevated reef at 
Bahia Honda is the most western point to which portions of the inner 
elevated reef have been traced. Undoubtedly there are patches of it 
still left in from two to three feet of water off the line of keys extend- 
ing westward from Big Pine Key as far as Key West, and perhaps off 
the keys to the westward of that island. But west of Bahia Honda the 
inner elevated reef has been eroded, and no part of it reaches the surface. 
The material derived from this erosion having gone in great part as wolian 
sand to build up the line of keys to the west of Bahia Honda. 
At Boot Key we found a patch of the elevated reef about two feet 
above high-water mark, honeycombed, pitted, and full of heads of Mæ- 
andrina, Orbicella, and Colpophyllia, as well as of massive conchs. А 
coral sand beach covers the elevated reef to the eastward, but it crops 
out again farther east, as well as westward. Іп these patches occurred 
the same species of corals. Тһе borders of the elevated reef were covered 
with masses of tests of Echini, of fragments of Gorgonians, of sponges, 
and of blocks made up of bivalves which had become cemented to- 
gether. This material, if overwhelmed with calcareous sand and ce- 
mented and hardened, would form a magnificent bed of fossils. The 
upper parts of the beaches flanking the patch of elevated reef are covered 
with masses of Porites and of bivalves, and as we approach’ low-water 
mark this material is ground to fine powder. 
'l'he elevated reef at Indian Key (Plates VI., VII.) rises about six feot 
above high-water mark. It is exposed along the greater part of the 
outer edge of the island. Towards the interior the island is covered 
with low vegetation, and the surface of the higher parts of the elevated 
reef has been changed to à hard ringing limestono. The outer edge of 
the reef is pitted and honeycombed, and full of small pot-holes; the 
sea is gradually eneroaching upon the sea face of the тесі, and eating 
slowly into the island. Тһе corals observed are mainly species of 
Orbicella, Colpophyllia, and Mieandrina, 
At the eastern extremity of Lower Matecumbe the elevated reef, which 
is hidden by coral sand for the greater length of the island, has been ex- 
posed by the hurricane of September, 1894. During that hurricane 
about sixty feet in width of the coral sand beach was carried away, 
leaving the underlying elevated coral reef fully exposed, but not more 
than twelve to fifteen inches above high-water mark, very much lower 
than at Indian Key. 
We examined the shores of Key Largo at two points, one near the 
western extremity of Card’s Sound, the other about half-way between 
