474 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Attleboro, not only in the way they had weathered in some layers 
to an almost incoherent soft spongy mass but also in the peculiar 
appearance of the thin white hair-line cross-sections of the small 
fossils. There were also pebbles of a more compact rock resem- 
bling the slates of Pearl Street, North Weymouth, and these con- 
tained, moreover, epidotic concretions like those characteristic 
of the Weymouth rocks. Still others were composed of a red or 
pinkish-white limestone with a pitted surface. These pits are in 
some cases deep and narrow enough to be called tunnels; they 
ramify in all directions with no relation to the stratification or to 
any observed fossils. So far as I know, this mode of weathering 
has not been observed in any of the Lower Cambrian outcrops 
about Boston. Boulders of hmestone and chert weathered in 
this peculiar way have been found by the writer on the beaches 
at Hull, Massachusetts. 
The fossils are scarce. Most of the pebbles yield none, but 
the complete list is imposing for this region, and is given below. 
Species that have been reported previously from near-by localities 
(including Washington and Rensselaer Counties, New York) are 
so designated. 
Acrotreta taconica (Walcott) — eastern New York. 
Acrotreta sp. 
Hyolithes americanus Billings — North Attleboro, Nahant, Massachusetts; 
eastern New York. 
H. impar Ford — Nahant, Massachusetts; eastern New York. 
H. princeps Billings — North Attleboro, Nahant, Massachusetts. 
Orthotheca cylindrica Grabau — North Attleboro, Nahant, North Weymouth, 
Massachusetts. 
Salter ella sp. 
Eodiscus bellimarginatus (Shaler and Foerste) — North Attleboro, Massa- 
chusetts. 
Weymouthia ndbilis (Ford) — North Weymouth, Massachusetts; eastern New 
York. 
Callavia, two species — North Weymouth, Massachusetts. 
Ptychoparia attleborensis (Shaler and Foerste) — North Attleboro, Massa- 
chusetts. 
Agraulos sp. 
Dipharus insperatus, gen. et sp. nov. 
Acrotreta taconica, Hyolithes princeps, Orthotheca cylindrica, 
Callavia sp., and Ptychoparia attleborensis are fairly common; 
the other species are represented by one or two specimens each. 
