281 
1911-12.] Report on Rock Specimens. 
deeply etched and its colour more faded than the other. The two narrower 
specimens are much fresher. All have lain sufficiently long on the bottom 
to be partially embedded in the ooze, and for arenaceous foraminifera and a 
small species of serpula to attach themselves on both the inside and the 
outside of the parts not embedded. 
The oyster shell has certainly been brought by human agency, as it is 
not the European Ostrea edulis but a line characteristic specimen of the 
American “ Blue Point ” that has only been an object of import into Europe 
since fast “ Atlantic liners ” began to run between the two continents, about 
the end of last century. Both valves of the shell are preserved, and when 
brought up, the hinge cartilage must have been unbroken, and is still quite 
fresh, while the inside nacre still retains its sheen (PL IX. fig. 2). 
Shallow-water polyzoa and an agglutinated sandy worm-tube are still 
attached to the valve that lay uppermost during life, which is indicated by 
its other valve having been attached to some hard substance, evidently 
another oyster shell. The organisms have therefore been brought from 
America with the oyster, for no organisms like those attached to the Balani 
have been found on the shell, which evidently has not lain long enough, at 
this Station, for their growth. 
Station 70. 30th June 1910. 
Lat. 42° 59' N., long. 51° 5P W. ; depth 1100 m. (601 fms.). 
The material from this Station consists of seven rock fragments. The 
largest of these (2 x 1J X 1 inches) is of greenish, fine-grained, hardened mud- 
stone, and is well glaciated. One small piece, just over 1 inch in diameter, 
of a light grey limestone, is polished and striated on one side only, the 
others showing fresh fractures. It is evidently only a portion of a boulder. 
One layer of the limestone is full of small organisms, mostly foraminifera, 
and shows sections of what appear to be pteropods on the fracture-faces. 
The parent rock is therefore in all probability of Tertiary age. A tiny 
piece of calcareous sandstone is apparently from the same source as the 
limestone. 
One small glaciated fragment of gneissose amphibolite (1 inch in 
diameter) represents the metamorphic rocks. 
Igneous rocks are represented by one specimen (1 inch in diameter) of 
gabbro or coarse-grained dolerite and two small glaciated fragments 
(J inch in diameter) of basic rock, much epidotised basalt, which probably 
represent Tertiary lavas. 
Adhering to one side of the largest stone is sandy mud — not an organic 
