74. BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
was a comparatively coarse white sand-rock with very few determinable organic 
remains 1n it. 
375 feet. — Color yellow gray-white. A sand-rock with many coarse par- 
ticles in it. The fine angular quartz sand is present in very small amount, 
with an occasional much coarser particle which is well rounded on account of 
abrasion. Very, very little of the material is determinable. I noted a few 
small bits of coral and more fragments of lamellibranchs, three or four spines 
of echini, and as many pieces of annelid tubes. Some ovules are present. 
The coarser partieles of the general sample are angular bits of dense white 
limestone. 
400 feet. — Color a decided gray, iu marked contrast with the white rock of 
the preceding samples. Тһе rock was a rather loosely compacted sand-rock, 
containing some porous, hard, white fossiliferous portions. A few bits of oólite 
and some single ovules were noted, also white. The limpid angular quartz 
sand is present in noticeable proportion. It is very fine and uniform in grain. 
One foraminifer, two or three kinds of coral, some fragments of bryozoa, more 
lamellibranchs, part of the internal cast of a gastropod, portions of annelid 
tubes, and bits of nullipores (7) were observed among the meagre determinable 
organic remains. 
425 feet. — Color decided gray. The fossils are white. The gray sand-rock 
which makes up more than nine tenths of the sample seems to contain very few 
fossils; these are mostly to be found in the hard, dense, and porous white 
masses which are scattered through the gray. The quartz is present in com- 
paratively large proportion, mostly very fine grained and angular, but with 
an occasional more or less rounded particle. One of the last measured 
1.5 x 1mm. Determinable organic remains are scarce, as usual, and are for 
the most part of lamellibranchs (shells, casts, and imprints). Noted also a few 
bits of coral and a few fragments of echini (spines, tests, and internal facetted 
supporting pillars), and part of the frond of a bryozoan. Small oólite aggre- 
gates are not uncommon. A single minute brachiopod was found, concerning 
which Prof. W. H. Dall writes me, “It is either the cistella stage of a large 
species, or a small species of Cistella. 1 am inclined to believe it the young 
of a larger species.” 
450 feet. — General color and character of sample are like the last. The 
rock consists of loosely compacted, very fine grained calcareous sand, with 
occasional lumps of hard white limestone. The limpid quartz sand is present 
in very small amount, but with the same characteristics as before. Measure- 
ments of some of the grains were 0.1 mm, 1.5 mm., 0.09 mm., and 0.11 mm. in 
diameter. Angular pieces of secondary calcite as in many of the samples. 
Some bits of oblite observed. Internal casts of lamellibranchs тате, Fewer 
of the angular fragments of solid limestone present than in the last two sam- 
ples, and almost nothing is determinable. 
475 feet. — Color decided gray, more uniform in color and texture than the 
three above. This is a lime sand-rock, somewhat friable, like the last three 
samples, except that it contains fewer fragments of solid limestone than even 
