Article II . — Spo?iges in Laurentian Rochs. 
43 
Fif?. 1. Cyathospongia 
eozoica. Mag. 80 diam. 
As only fragments of the skeleton of this sponge are 
known, the reference to Cyathospongia is conjectural, 
In the size of its mesh this sponge 
may be compared with fragments of 
hexactinellid sponges found in the 
basal (Etchimenian) series of the Cam- 
brian rocks of this region. The mesh 
of the sponge is much smaller than 
that of Protospongia fenestrata, Sal- 
ter, of the Welsh Cambrian rocks; it is 
also smaller than P, minor of Div. Ich 
of the St. John Group. 
Horizon. In the quartzites of the middle division of the 
upper series. 
The great limestone beds of the upper division are present in 
force at Drury’s cove and vicinity, and contain beds, some of 
which are bitumenous and others graphitic. On examining 
these limestones, graphitized layers were found whose surfaces 
exhibited numerous spicules of sponges. Finding the sponge 
remains particularly abundant on the graphitic layers, I was 
induced to examine the surfaces of the graphite, which is 
found in irregular beds in the upper part of the Laurentian 
rocks near the Falls of the St. John river. These graphite 
beds proved to be remarkably rich in sponge remains. So 
plentiful are the groups of spicules on the layers of the 
rock, that the individual form of the sponge could not 
be made out. 
Halichondkites Graphitiferus. m. sp. 
I did not detect Protospongia or Cyathospongia in the 
graphitic shales, but there are immense numbers of simple 
spicules; long, acerate, and mostly in parallel sets. The sets 
of spicules lie across each other at all angles. 
So far I have been unable to determine whether this 
sponge, with bands of parallel acerate spicules, is a monac- 
tinellid or hexactinellid sponge, and therefore refer it to Sir 
Wm. Dawson’s provisional genus Halichondrites. 
Horizo7i. In graphitic slates in the lower half of the 
.upper division. 
