68 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
SURFACE and 25 feet, a yellowish white, friable oólite destitute of de- 
terminable organic fragments. 'There is a mere trace of the angular 
quartz sand at the surface, but apparently none from 25 feet. 
50 to 175 feet, a white, yellowish white, or very light gray, more or 
less compact limestone with oólitio lumps in it. Recognizable remains 
are mostly lamellibranchs, but the 50 foot sample is also foraminiferal. 
Quartz sand is lacking in the 50 foot sample, but is present in varying 
small amounts in the others. 
200 feet. — A fine white sand-rock partly compacted and almost 
destitute of determinable fragments. Contains a small amount of the 
quartz sand. 
225 to 275 feet. — A porous, white, soft, somewhat oólitio and sandy 
rock containing some bits of lamellibranchs, but almost nothing else 
recognizable. The quartz sand contains the relatively large rounded 
grains already mentioned. There is a comparatively large amount of it 
(the quartz sand) in the samples from 250 and 275 feet. 
300 to 375 feet. — White, more or less solid sand-rock containing a 
few ovules and a little oólite and some masses of denso limestone. Very 
few determinable organic remains are present; among these, indications 
of echini are relatively numerous at 325 feet, and of lamellibranohs at 
375 feet. A comparatively large amount of the angular quartz sand 
was observed at 300 and 325 feet, and a small amount at the other two 
depths. 
400 to 675 feet. — A decidedly gray sand-rock, presenting a marked 
contrast to that above, soft and friable, but containing hard, dense, 
light gray limestone at 500 feet, and rather hard, porous, almost white 
rock, with granular calcite at 525 feet. Color seems darkest in the 
samples from 400 to 475 fect. The quartz sand, which is present in 
varying amounts, shows in some of the samples a rolatively large number 
of the coarse rounded grains. "There is a great dearth of recognizable 
fragments throughout this lot, and at 550 feet there seem to be none. 
Of the few organic remains that can be determined lamellibranchs 
appear to be the most numerous. А single minute brachiopod was 
found at 425 feet, concerning which Prof. W. H. Dall writes me: 
“Tt is either the cistella stage of a large species, or a small species of 
Cistella. Т am inclined to believe it the young of a larger species." 
700 to 1,075 feet. — A sand-rock varying in color from a yellowish 
white in the upper portions to a very light yellowish brown in the 
lower. Тһе texture of the rock varies somewhat, also, being more of 
shell-rock at 725 feet, and a rather hard, porous rock from 750 feet to 
