74 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



was a comparatively coarse white sand-rock with very few determinable organic 

 remains in it. 



375 feet. — Color yellow gray-white. A sand-rock with many coarse par- 

 ticles in it. The hue 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 particles of the general sample are angular bits of dense white 

 limestone. 



400 feet. — Color a decided gray, in marked contrast with the white rock of 

 the preceding samples. The rock was a rather loosely compacted sand-rock, 

 containing some porous, hard, white fossiliferous portions. A few bits of oolite 

 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 (?) 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 hi 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 1 mm. 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 oolite 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. I 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 a- before. Measure- 

 ments of some of the grains were 0.1 mm., 1.5 mm., 0.09 mm., and 0. 1 1 mm. in 

 diameter. Angular pieces of secondary calcite as in many of the samples. 

 Some bits of oolite observed. Internal oasts of lamellibranchs rare. Fewer 

 of the angular fragments of solid limestone presenl 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 liua'stone than even 



