GLACIAL BOULDERS OF OUR FISHERIES.—HONEYMAN. 209 
to it. This is a remarkable and unique specimen of Geodea. 
Between its base and the granite, Saxicava had inserted them- 
selves, and were there embedded. 
Numerous patches of bryozou still remain on the boulder. The 
sponge had to be detached for its safe keeping and proper 
examination. 
Having thus briefly described the boulders of Lower Cambrian 
rocks and associated Archean Granites with their varied and 
interesting attached and detached invertebrates, we now proceed 
with like brevity to notice the remaining gioup of our introduc- 
tory catalogue and attaches. 
(M.) another ponderous boulder is of deceptive appearance. 
It was long assumed to be a quartzite. Its perforation was 
regarded as remarkable. This also was brought from our fishing 
banks. When I directed particular attention to it, I found that 
it was a limestone. The application of the hammer showed that 
the perforations were deeper and larger than they appeared, and 
were occupied by Sazicava and Ophiura. The limestone is 
also recognized as of Lower Carboniferous age. 
(N.) is another limestone boulder. It is regularly stratified. - 
Saxicava have penetrated the strata horizontally; the upper 
strata present the aspect of a coral. This is caused by a coating 
of nullipores and bryozoa, which appears chalky from exposure 
to the rain and sun. It thus assumes quite a cretaceous aspect. 
The hammer shows the true character of the limestone. An 
Ophiwra and a small EHchinus occupied cavities. 
(O.) is of the same character with chalky patches. 
(P.) is another limestone boulder. This has been perforated 
by Saxicava entering on the edges of the laminee. The perfora- 
tions are empty. 
(Q.) Isa thoroughly perforated boulder of Lower Carboniferous 
Limestone. Its cavities contain one or two saxicava and serpula. 
A flat side is thickly studded with Spirorbes of, at least, two 
species. Numerous Serpulini lie among these. 
(R.) Is another limestone boulder, much perforated by 
Saxicava. A sinall one lies in a cavity. 
(S.) Is another. It is limestone veined with Calcite. It is 
