Some nezv Fossils from Eastern Massachusetts. — Hohbs. 1 1 1 
region being the uniformity of these directions, and consists 
of a micaceous slate, or schist, containing lenticular masses 
of an impure cherty limestone. The thickness of this mem- 
ber is also probably over 5,000 feet. The schistosity is par- 
allel to the plane of dip so far as observed, and is well de- 
veloped and generally uniform in amount. 
It is with the Lincoln slate that we are chiefly concerned 
in this paper, owing to the discovery of organic remains bv 
the writer. These remains consist of the borings of Annelida, 
together with the surface material cast out of the borings and 
what appear to be integumentary plates mingled with a few 
scattered worm teeth. These occur in a silicious, or cherty, 
limestone bed of lenticular shape and of limited extent, situ- 
ated about one mile northwest of the R. R. station of South 
Lincoln. The integumentary plates do not suggest the Hyo- 
lites shells, usually so common in Cambrian rocks, being more 
suggestive of the carapaces of some Annelid; yet it would be 
rash to conclude that there are no Hyolites present; what we 
seem to have is a decomposed mass of organic matter com- 
posed very probably of fragments of all the inhabitants of 
the sea of that time. In places, the limestone becomes black 
with carbonaceous material, but it is usually of white to grey 
highly crystalline texture, containing both primary and sec- 
ondary quartz. The mechanical movements of the region 
have produced, as a rule, more flowage than shearing or fault- 
ing in the limestone, whereas, in the adjoining slate, which is 
more brittle, the reverse has occurred. 
A hypothesis is plausible that the cherty matter, in part at 
least, came to its position in the limestone through the mix- 
ing habit of Annelida, being transported while in process of 
digestion from the silicious layers to the calcareous ones. The 
weathered surface is very suggestive of this, the loose aggre- 
gations of chert appear to have originated thus and to have 
been left in the little heaps so characteristic of worm action at 
the present time; these heaps remain or are scattered as 
chance determines. 
One interesting feature was observed with the luicroscopc 
where a burrow passed vertically upward through an integu- 
mentary plate, leaving a circular hole with the edges bent up- 
ward and outward. It is luilikely that the locality will over 
