New Species of Sponges. ess) 
In the shales containing the above species, the only other 
fossils observed were slender fucoids, a small Obolella and a 
minute Cystidean or Crinoid, as follows :— 
Obolella Ida? Billings. 
I refer the specimens of Brachiopods found to this species, 
which belongs to the Lévis division of the Quebec Group. 
The valves are mostly pyritized, but sometimes flattened 
and then represented by a mere carbonaceous film. Mr. 
Whiteaves, to whom I have shewn these shells, agrees 
with me on their probable reference to one of Mr. Billings’ 
smaller species from the Quebec Group. 
Oystites ? 
A small-jointed stem one centimetre in length, with an 
elongated, flattened, oval mass at one end, in which, how- 
éver, no distinct plates can be discovered. 
Buthotrephis pergracilis. 8. N. 
Stems very long and filexuous, about one millimetre in 
diameter, and obscurely striate longitudinally ; sending off 
at their extremities short alternate or opposite branches. 
Allied to B. gracilis, Hall, of the Siluro-Cambrian, but 
much more elongated and slender. These plants are 
replaced by pyrite. 
Note on Cyathophycus reticulatus. Walcott. 
In the collection of minerals of the late J. S. Miller, Hsq., 
of Ottawa, purchased for the University. are a few fossils, 
some of them Canadian, others from the phosphate deposits 
of South Carolina. Among the former ave a few specimens 
of Utica slate fossils, which, from their appearance I sup- 
pose, have been collected in the beds of that formation near 
Ottawa, though it is possible that some of them may have 
been obtained from the United States. They include 
a specimen of the above species, which Mr. Ami, who 
has collected extensively in these beds at Ottawa, informs 
me has not yet occurred to him. The specimen is a small 
slab of the ordinary Utica shale, having an impression of a 
