66 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
corals from near Tampa, on the west side of the peninsula,  'The 
rounded grains, which are much fewer in number than the others, are 
evidently transported particles and must have come from a distance, 
since such quartz is not indigenous to any rocks in the vicinity of Key 
West. 
The angular quartz sand was present in largest amount at the follow- 
ing depths: 250 to 325 feet inclusive, 400 and 425 feet, 800 feet, and 
1,250 feet. Тһе least was seen at the surface, at 25 and 50 feet (none), 
100 feet, 150 feet, 725 feet, 775 feet, 850 to 1,225 feet inclusive, 1,300 
feet, 1,325 feet, 1,375 feet (none ?), and below this there is only a trace in 
each sample. 
With almost all the samples a floceulent precipitate settled out of the 
НСІ solution after a time. This varied in color from a very light gray 
through brown to a greenish black. "The nature of this precipitate was 
not determined. 
The surface oblite, though friable, was sufficiently compact to yield a 
thin section. Тһе nuclei of almost all the ovules are rounded or sub- 
angular calcareous grains. One ovule was observed the nucleus of 
which was a grain of quartz. The matrix of the oólite is very finely 
divided soft rock, composed of entirely unrecognizable material as far as 
any organic remains were concerned. 'The surface rock, in fact, and that 
from 25 feet as well, seem to be entirely devoid of determinable organic 
fragments. Small lumps of oólite or loose ovules were noted in about 
half of the samples scattered along from top to bottom. The upper 
half of the section is more odlitic than the lower, and the upper 500 
feet. more than any other portion. In appearance the ovules differ from 
ordinary rounded grains of sand in being more regular in outline and in 
having the exterior more highly polished. Many of these highly pol- 
ished, regular ovoids were cracked open with a light blow of a hammer, 
or by pressure on a glass plate, thus revealing the concentric shells 
characteristic of true odlitic structure. То the present writer it seems 
important to confine the term oblite to rocks composed of these con- 
centrically built spherules embedded in a matrix, and not to extend it as 
some writers are inclined to do to rocks made up merely of well rounded 
fragments embedded in a more finely comminuted matrix. 
Organic remains which retain sufficient character for one to refer them 
even to their class are not numerous except in a few of the samples, 
and three of them (surface, 25 feet, and 550 foet) showed no determinable 
fragments, Foraminifera are abundant at 50 feet from the surface, and 
sparingly present at 75, 325, 400, 575, 625, and 675 feet, At 725 feet 
